View the most popular Social Media Networks and meet the ones that are totally new to you! You may discover some gems for your business!

1. Facebook - 800,000,000 Estimated Unique Monthly Visitors
Facebook is officially the biggest online social networking service. Users register before using the site, after which they may create a personal profile, add other users as friends, exchange messages, and receive automatic notifications when they update their profile. Additionally, users may join common-interest user groups and categorize their friends into lists. It now allows anyone who claims to be at least 13 years old to become a registered user of the website.

2. Twitter - 250,000,000 - Estimated Unique Monthly Visitors
Twitter is an online social networking and microblogging service that enables users to send and read "tweets", which are text messages limited to 140 characters. Registered users can read and post tweets, but unregistered users can only read them. Users access Twitter through the website interface, SMS, or mobile device app.
 
3. LinkedIn - 200,000,000 - Estimated Unique Monthly Visitors
LinkedIn is a social networking website for people in professional occupations. It is mainly used for professional networking and it is available in 20 languages. One purpose of the site is to allow registered users to maintain a list of contact details of people with whom they have some level of relationship, called Connections. Users can also invite anyone (whether a site user or not) to become a connection, search jobs, review profiles, follow companies and introduce or get introduced to business contacts.

4. Google Plus - 150,000,000 - Estimated Unique Monthly Visitors
Google Plus is a social networking and identity service that is owned and operated by Google Inc. Google+ profiles are used as the background account for many Google Services including YouTube, Gmail, Google Maps, Android, Google Play, Google Music, Google Voice, Google Wallet, Google Local and more. A Google+ User profile includes basic social networking elements like a profile photo, about section, background photo, previous work and school history, interests, places lived and an area to post status updates.

5. Pinterest - 140,500,000 - Estimated Unique Monthly Visitors
Pinterest is a pinboard-style photo-sharing website that allows users to create and manage theme-based image collections such as events, interests, and hobbies. Pinterest users can upload, save, sort and manage images, known as pins, and other media content (e.g. videos) through collections known as pinboards. Users' content and the content of others can be browsed on the main page. Users can then save individual pins to one of their own boards using the "Pin It" button, with Pinboards typically organized by a central topic or theme. Content can also be found outside of Pinterest and similarly uploaded to a board via the "Pin It" button.

6. Tumblr - 125,000,000 - Estimated Unique Monthly Visitors
Tumblr is a microblogging platform and social networking website owned by Yahoo! Inc. The service allows users to post multimedia and other content to a short-form blog. Users can follow other users' blogs, as well as make their blogs private. Much of the website's features are accessed from the "dashboard" interface, where the option to post content and posts of followed blogs appear.

7. Flickr - 67,000,000 - Estimated Unique Monthly Visitors
Flickr is an image hosting and video hosting website, and web services suite that was created by Ludicorp in 2004 and acquired by Yahoo in 2005. In addition to being a popular website for users to share and embed personal photographs, and effectively an online community, the service is widely used by photo researchers and by bloggers to host images that they embed in blogs and social media. Photos and videos can be accessed from Flickr without the need to register an account but an account must be made in order to upload content onto the website.

8. VK - 65,400,000 - Estimated Unique Monthly Visitors
VK (VKontakte, Russian: "in contact") is available in several languages but popular particularly among Russian-speaking users around the world, especially in Russia, Ukraine, Azerbaijan, Kazakhstan, Moldova, Belarus, and Israel. As with most social networks, the site's core functionality is based around private messaging and sharing photos, status updates and links with friends. VK also has tools for managing online communities and celebrity pages. The site allows its users to upload, search and stream media content, such as videos and music. VK features an advanced search engine, that allows complex queries for finding friends, as well as a real-time news search.

9. Instagram - 50,000,000 - Estimated Unique Monthly Visitors
Instagram is an online photo-sharing, video-sharing and social networking service that enables its users to take pictures and videos, apply digital filters to them, and share them on a variety of social networking services, such as Facebook, Twitter, Tumblr and Flickr. A distinctive feature is that it confines photos to a square shape, similar to Kodak Instamatic and Polaroid images, in contrast to the 16:9 aspect ratio now typically used by mobile device cameras. Users are also able to record and share short videos lasting for up to 15 seconds.

10. DeviantArt - 30,500,000 - Estimated Unique Monthly Visitors
DeviantArt is an online community showcasing various forms of user-made artwork. DeviantArt aims to provide a platform for any artist to exhibit and discuss works. Works are organized in a comprehensive category structure, including photography, digital art, traditional art, literature, Flash, filmmaking, skins for applications, operating system customization utilities and others, along with extensive downloadable resources such as tutorials and stock photography. Additional utilities include journals, polls, groups and portfolios.

11. MySpace - 26,500,000 - Estimated Unique Monthly Visitors
MySpace is a social networking service with a strong music emphasis. Myspace was launched in August 2003 and from 2005 until early 2008, was the most visited social networking site in the world! Myspace had a significant influence on pop culture and music and created a gaming platform that launched the successes of Zynga and Rock You, among others. The site also started the trend of creating unique URLs for companies and artists. Among the website features are bulletins, groups, MySpaceTV, Myspace IM (instant messenger), a full service classifieds listing, audio uploading with user’s recordings of themselves singing onto their profile page (which allows ratings from friends), moods, blogs, multimedia, commenting, and personal page design customization.

12. CafeMom - 22,500,000 - Estimated Unique Monthly Visitors
CafeMom is an ad-supported social networking site which is specifically targeted at mothers and mothers to be.
Anyone can join CafeMom and become a member as long as you are not a dad.-It is a dad free zone-. If men try to join, their accounts are deleted in order to keep CafeMom a place where women can talk freely about the diverse issues that concern them. Dads can go onto the page and get information and advice from sources such as Cafe Answers; they are just not permitted to be a member. There are two different ways to use the CafeMom website; one way is for nonmembers and the other for registered users. If you are not a member of CafeMom and are still interested in using CafeMom, you are free to browse the website to find information, read posts and articles without logging in. You are also able to use the search option to find information on something specific. As with other social networking sites you need to be a member in order to ask questions, post your own advice or create a blog. As a bonus, a member can also choose to receive free products from various companies that sponsor CafeMom.

13. Tagged - 20,500,000 - Estimated Unique Monthly Visitors
Tagged is a social discovery website that allows members to browse the profiles of other members, play games and share tags and virtual gifts.
After registering a free account, Tagged users can customize their profile page, post a biography and interests, post status updates, upload photos, and send and receive messages. Users can also see which other users have recently viewed their profile. They can also sort videos by most viewed, top rated, and most liked, and send virtual gifts to their friends. Virtual gifts are bought with "gold" which users buy with actual money or receive by completing special offers or tasks. There are chat rooms where users engage in real time online chat according to their age and mood. Designed to facilitate relationships and dating, Tagged allows users to send and receive notifications for "Luv", "Winks", and "Meet Me", a rating engine that allows users to rate the attractiveness of photos submitted by others.

14. Meetup - 17,500,000 - Estimated Unique Monthly Visitors
Meetup is an online social networking portal that facilitates offline group meetings in various localities around the world. Meetup allows members to find and join groups unified by a common interest, such as politics, books, games, movies, health, pets, careers or hobbies. Users enter their postal code or their city and the topic they want to meet about, and the website helps them arrange a place and time to meet. Topic listings are also available for users who only enter a location. Meetup receives revenue by charging Organizer Dues to administrators of groups, currently at $12 to $19 per month depending on the payment plan.

15. LiveJournal - 10,900,000 - Estimated Unique Monthly Visitors
LiveJournal (LJ), or Zhivoy Zhurnal (Живой Журнал) / ZheZhe (ЖЖ) in Russia, is a social network owned by SUP Media where Internet users can keep a blog, journal or diary, and is also the name of the free and open source server software which runs the LiveJournal website and online community. A wide variety of political pundits also use the service for political commentary, particularly in Russia, where it partners with the politically independent online newspaper Gazeta.ru (also owned by parent company SUP Media).

Sources: Alexa & Wikipedia