> Alternative social networks such as Instagram, the photo sharing site that won 30m users in 18 months before Facebook acquired the business a year ago, have s

> Alternative social networks such as Instagram, the photo sharing site that won 30m users in 18 months before Facebook acquired the business a year ago, have seen surges in popularity with younger age groups. I don't think losing users to Instagram in particular should bother Facebook, since they bought it a year ago.