UNITED STATES: Facebook has topped one billion users - despite a rocky few months.

CEO Mark Zuckerberg said the company is going through a bit of a "rough cycle" after its troubled initial public offering in May.

Mr Zuckerberg , 28, updated his Facebook status to announce that the social networking site has more than one billion users each month.

There were trading glitches the day it went public and concerns about its revenue potential. It also faces lawsuits from disgruntled shareholders.