Spamming your friends on Facebook to earn 0.1BTC seems just as desperate as anything else I've seen...
The non-snarky answer is that I really think it boils down to participation. Bitcoin is new, interesting, and for better or worse, a little "trendy." Being part of the Bitcoin economy is worth a discount to these people who are offering their services at what seem to be too-low prices. Add to that a sense of "investment," and I am confident all these people feel they are being fairly compensated. I don't honestly think your offer to post someone's website address on your Facebook in exchange for Bitcoins is desperate. I *do* think it is an easy way to maybe get a few Bitcoin without having to go through the hassle of setting up an exchange account or taking the risk of sending someone dollars for Bitcoin. I agree with other people who feel it is more unbridled enthusiasm than desperation. Maybe their posts are a little melodramatic, but they just want to be part of the community!
As to the begging, well, yeah, that gets old:
http://img522.imageshack.us/img522/9095/southparknightoftheliviha5.jpgSpare some change?
