I have said it before, and will no doubt say it again; but Facebook suffers from the horrible problem that its main features are also its main flaws.
Applications allow you to do plenty of interesting and unusual things, but they are getting out of control. 12 invites in a day? All from people who were tricked into sending them instead of finding a hidden skip button!
It simply will not work.
This month saw Facebook's first ever drop in users; and while it is still number one, it won't be much longer unless they sort out the glut of annoyances that the site is creating.