PayPal has joined Facebook! You can now add PayPal buttons to your Facebook profile to raise money for your favourite good cause: the badge can be personalised with a picture and message of your choice, and you can measure how you’re progressing towards your goal.
You can also simply send money with PayPal for Facebook. PayPal say “Does a coworker owe you for lunch? Did you spot somebody $20? No need to drop hints to get your money back”, which all sounds a bit passive aggressive if you ask me, but no doubt some people would prefer to pay PayPal fees than ask for their cash.