BluePhaze
first of all, nice score - more than my wife got^^ And next to your questions:
1. top scores are stored in a mysql database together with the facebook user id and the players name
2. these informations come from the facebook plugin
3. cause you normaly only see your friends scores in facebook games, I decided to do it this way
4. the pictures are loaded thrue facebooks graph-api and basd on the user id
5. post score actions are based on tokens (The Posts on your Feed, when you get a new Highscore)
6. and I didn´t try to go letterbox scale, because for me this was only a test of integrating facebook into construct
and I can say, integration works (with some minor bugs)... but it´s not very usefull until scirra will release a facebook-plugin with all features implemented. Actual it´s a lot of try and error.
best regards and thanks for testing
Stefan