YouTube
VK
Tumblr
Meetup
Vine
Snapchat
Flickr
Flickr is Yahoo’s popular photo-sharing network, which existed long before other popular competing networks like Pinterest and Instagram entered the social photo-sharing game.
Foursquare
Foursquare has broken up its location-based app into two parts. While its main Foursquare app is now meant to be used as a location discovery tool, its Swarm app is all about being social.
Ask.fm
Ask.FM is an online question-and-answer site. Users can ask questions and respond to them, either by text or by posting videos, and they can do this anonymously.
Kik
Kik is a free instant messaging app that’s very popular with teens and young adults.
Yik Yak
Yik Yak is another social network that’s big with the younger crowd. It’s a location-based anonymous social sharing app that allows users to read short updates posted by people around their area.
Myspace
Myspace is a social networking website offering an interactive, user-submitted network of friends, personal profiles, blogs, groups, photos, music, and videos.
Periscope
Periscope is all about live web video broadcasting from your mobile device. It’s a Twitter-owned app that’s had its fair share of rivalry against another competing broadcasting app called Meerkat.
Medium
Medium is perhaps the best social network for readers and writers. It’s sort of like a blogging platform similar to Tumblr but features a very minimal look to keep the emphasis on content that’s shared there.
SoundCloud
SoundCloud is the world’s most popular social network for sharing sounds.
Tinder
Tinder is a popular location-based dating app that matches you up with people in your area.
https://slack.com/
Slack is a popular communication platform for teams that need to collaborate closely with one another. It’s a social network for the workplace. Team members can take advantage of real-time messaging, integration with other popular services like Dropbox and Trello, deep search for files and other information, configurable notifications and so much more.
https://musical.ly/
Musical.ly is a social networking app for sharing short music videos. The app shares a lot of similarities with Instagram and Vine, allowing users to record short videos, edit them, post them to their profiles, follow other users and see what’s trending.
http://peach.cool/
Peach only debuted in early 2016, so it’s unclear whether this app is going to catch on or not.
http://www.apsense.com/
Start Networking and Building Your Online Business With Like-Minded People Around The World.
https://plus.google.com/
Making its debut in the early summer of 2011, Google+ became the fastest growing social network the web has ever seen.
Awesome, Thanks a lot for the kind words.