Instagram Usage in the US Surges 35% in 2013, Rivals Twitter for Smartphone Audience
According to new eMarketer figures, Instagram usage in the US has ramped up rapidly and is already maturing, reaching regular usage levels nearly matching Twitter's. Especially among core user groups such as millennials, Gen Xers and all smartphone users, Instagram's penetration levels are very similar to Twitter's.
Source: eMarketer, March 27, 2014
Tango Media Management