Which are the other social networks that remain behind Tumblr? Both Pinterest and Instagram trail not too far away, where the number of active users saw a 6 month increase of 111% and 64%, respectively. It is also interesting to see that all the rest of the major social networks in the market exhibited a superior growth rate compared to Facebook. For instance, LinkedIn saw a 54% growth, Twitter at 26%, YouTube pegged slightly less at 25%, and Google+ at 16%. This is more or less expected to happen, especially when you are a huge behemoth like Facebook, your growth will no longer be exponential, but rather, in a gradual manner. After all, no company can continue to experience exponential growth all the time.