Dive Brief: 

• According to a report from Simply Measured, social photo sharing platform Instagram is now the fastest growing social network. 
• Brand engagement (likes and comments) on the network is up 350% over last year, with 71% of top brands now participating. 
• These findings show Instagram into contention with other top social sites with high brand participation, like Google+ (73%) and Pinterest (74%). 

Dive Insight: 

It's not surprising that brand participation on Instagram is up, especially with in-stream ads rolling out. It's promising, though, that engagement has grown so dramatically. With that kind of growth, it is likely that Instagram will soon pass Google+ and Pinterest in brand participation.