Just take
bitcoin-app.com as a nice and easy (and free) way to make your first experience with Bitcoins. And for people that do not care too much about the
anonymity aspect of Bitcoins ( e.g. facebook users
), it is a fee-free and fast way to exchange coins. At least more than 250 users seem to "like" it
It's definitely worth a try, and FB is a huge market to popularise BTC. Just use it for micropayments, you can always use the regular client for larger transactions.