
I wonder how many will fall for it.
What do you mean, "fall for it", they work DDOS attacks by using the LOIC program. To "participate" you download the program and enter the given IP and/or URL.
What do you think Facebook is? Why install spy cameras when people would just upload 'evidence' to their drunken party photo albums themselves?
It's there to provide aggregate data to advertisers and Facebook (who uses it for advertising).
facebook has too many firewalls and other protections that it would be impossible to take it down
You don't know DDOS attacks work, do you?
http://en.wikipedia.org/wiki/Denial-of-service_attack
Given they could try an SQL injection (which is there second favorite type of attack it seems) but I assume Facebook would have put in "countermeasures" for that by now.