They actually took one idea from the forums, which was the hell part.
Some viewers thought the people in lost had already died and arrived in some sort of "hell" or "afterworld" where they got a chance to set things straight, and if they didnt, they'd pay for it.

This was beeing said in season 1, before you knew they had found the plane with the false bodies...anyway, long story short, lockes dad thinks its hell, and this idea was taken from the community.

Edit: Not gonna say anything about the whole R=U thing, I personally think its quite possible, at the same time as it isnt, but from my experience, backink up the theory is worse than thinking 9\11 was an inside job. People will just throw skullskullskullskull at you, and say "its stupid" and leave it there.