i tryed some links from clay.io for testing at fb but it comes a error with post, maybe the game was not for facebook canvas.
seems clay.io is temporary limites for new accounts.
do you have a https: game link, exported from construct2 for using at fb?
i want use/test it for web preview button there.
i got new hope, i got start a game in facebook canvas hosted at scirra
there was a link for embedded i used at facebook "Secure Canvas URL"
its not my game, its just any game i picked for a test.
next i will upload my game here and see what happens.
arrgg the link does not work "Developers » Upload a Game" ... edit: < today here it works
haha, the scrirra arcade export is disabled until the next version is finished... need wait...
edit: found something interesting in manual for google drive
arrg seems this trick not work anymore with facebook.