There are a lot of Facebook groups out there claiming that on some date certain, such as July 9, 2010, FB will either start charging all users for access, or will divide its services into free and premium access levels.
Think, people, think!
Do any of these groups point to a Facebook news release or an article on a major news website supporting this claim? No? Then why do you support them by joining?
Whoever started these rumors may not be trying to scam you out of your money like the “free gift card” folks are, but they are scamming you nonetheless, and they’re having a good laugh at your expense.
On the plus side, your experience may be fodder for some psychology PhD dissertation on social engineering.