meteficha/fb — comment on commit 91854801208c07c0b82996f290bd6b231bd0a162
File: src/Facebook/Auth.hs line 153
By meteficha:

Well, it works for `/me`. Ok, sorry, bad joke. =)

`/me` works only for user access tokens, while this one works for both. AFAIK, there's no documentation about (a) if and how an app access token could become invalid, but I assume it's possible, and (b) how to check if an access token is valid (either user or app).