For a supposed billion dollar company like Facebook, they are still unprofitable.
Few companies can ever survive as long as they have without ever showing a net profit. Facebook has been fortunate to continue receiving hundreds of millions of investment dollars.
I think about 5 years ago Classmates must have started running out of money, or simply didn't have much income and noticed their growth prospects were dwindling. I think when that happened they started increasing pressure for people who visit their site to go with pay-services, and somewhere in the process the d!ckheads that run it decided it was ok to be sleaze-bags about it. Afaik, they weren't always such dirtbags.
Truth is they waited too long to do an IPO, and when they decided to go ahead, the market was weak. Instead of taking what they could, they canned the IPO for a future date. But even now that the market has recovered, there's not a snowball's chance in hell they can raise money thru an ipo with all the fraud claims against them.
Hopefully the site dies a glorious death soon.