Chess.com vs Facebook app.
I first found Chess.com through the Facebook application created by Chess.com. I had such a good time on there I had to come to the parent site.
I was a little disappointed at first that I had to create a new account and start over as my stats from the Facebook app did not carry over. The move was well worth it however.
The calibre of player at Chess.com are by far more difficult that those I faced on Facebook. I was holding a 1350 rating on FB and I am struggling at 1150 here. That is quite ok thought because I am learning so much more here. Chess.com has great resources.
Why do you think the players here are so much stronger than on the FB site? The only thing I can really think of is that chess players search out a "chess" site to play on and Facebook players are more casual players.