Social Networking Stats: Instagram Hits 15 Million Users, #RLTM Scoreboard

The #RLTM Scoreboard:  Social Networking Stats for the Week

Facebook: over 800 million users via Facebook
Twitter: over 200 million users via ReadWriteWeb
Renren: over 170 million users via iResearch iUser Tracker
Qzone: 500 million active users via China Internet Watch
Sina Weibo: over 250 million users via Forbes
LinkedIn: 135 million members via LinkedIn
Groupon: 115 million subscribers via Reuters
Google Plus: over 62 million users via Paul Allen
Tumblr: 39 million blogs via Tumblr
Posterous: 3.9 million members via SF Gate
Pinterest 3.2 million monthly uniques via TechCrunch
Foursquare: 15 million users via Mashable
Instagram 15 million users via The Next Web

Please email if you have additional updates, or a social network that you feel should be on the list.

Instagram Hits 15 Million Users

Instagram Gains 15 Million UsersPhoto-sharing app Instagram added an impressive 6 million users in about two months, reaching a total of 15 million users in December 2011, according to The Next Web.  Instagram added 2 million new users in November 2011 alone, leading SocialFresh to dub it the “largest mobile social network” (translation: a social network “where the majority of user activity is from a mobile device.”)

While the app is only available for iPhone, Instagram is “already outpacing” the growth of Foursquare – another mobile social network – despite the latter’s presence on multiple devices, including iPhone, Android, Blackberry, Nokia, Palm, and Windows Phone. Both Instagram and Foursquare were created as mobile apps first, not as websites with a mobile app added later.  The Next Web predicts another “massive increase in uptake” once the Android version of Instagram launches (it’s currently in the works.)

According to Jason Keath, “whoever is building the best mobile based social network today is only going to become more relevant tomorrow.”

Do you see Instagram as a photo-sharing app, a mobile social network, or both?  How long do you think rapid growth can continue for an app that grew from 0 to 12 million users in just one year?