I found Facebook docs and APIs to be really good, until they changed one which completely broke a revenue-generating app and didn't post any notification of the change until a week after it had already gone live.
That was a few years back, maybe they're better now. But I doubt it.
Both Facebook and Twitter are a complete dream compared to Valve's API for Steam and Team Fortress 2. Working with that is a complete nightmare, if it even provides a fraction of the capability you need (which it almost certainly does not).
They are still pretty bad. I'm struggling through a Unity integration right now where we need to use the latest Facebook plugin for Unity, but all their examples and tutorials don't compile with it because they renamed interfaces and the like.
You'll pretty much need to dig into the source, IRC is unlikely to be helpful. Documentation is basically nonexistent as well. With that said...it is what you're looking for and nearly every substantial bit of code built around Steam has been created using that library or the Node variant.
That was a few years back, maybe they're better now. But I doubt it.
Both Facebook and Twitter are a complete dream compared to Valve's API for Steam and Team Fortress 2. Working with that is a complete nightmare, if it even provides a fraction of the capability you need (which it almost certainly does not).