Just as a note of warning, the reported Facebook usage numbers are temporarily very, very wrong. The numbers that are being reported by Facebook are incorrect and have been for several days.
This is not a time to buy a Facebook app if you are basing your price on reported usage.
Adonomics has frozen their value estimates to the last know good numbers (Feb 14th).
Also of Facebook note:
Facebook has put an end to forced invites. This means that when you install a Facebook app, you will no longer be required to invite others just to use that app.
“as part of our ongoing efforts to improve Platform through policy and technology changes, applications are prohibited from dead-ending users at an invite-friends page, and must never again prompt for invites after the user has declined.”
Many apps that have gone viral have done so via this method, and a major change of thinking will be required for those apps that used to force you to invite your friends in order to use it.
Read the full article from Facebook here