Instagram account crackdown spreads panic, fear of hacking

A number of Instagram's 90 million active users are in a confused panic after being locked out of their accounts over the weekend, and several seem to believe they've been hacked.

On Saturday, the same day the Facebook-owned photo-sharing app enacted its revised terms or service, Yahoo Answers was inundated with threads from alarmed Instagram users who claimed to have lost access to their accounts for no apparent reason.

The longest question-and-answer thread, started by Yahoo user "moi," opened with an "Am I hacked?" query that soon had fellow forum participants worried that their security was compromised. Moi, like most of the other 57 people in the thread, was shown the following message, pictured below, when attempting to access the application this weekend: