Average engagement levels with pictures posted to Instagram by brands

"Social media measurement and analytics firm Simply Measured has released its third "quarterly" study on brand engagement on Instagram, finding 59% of brand consultancy Interbrand's Top 100 brands are on the photo-sharing network, which is up slightly from 54% in November.
In addition, Simply Measured found engagement has increased 35% with the average brand photo receiving 4,800 likes, comments, tweets and Facebook shares."

Source:  Clickz, 26th February 2013