I know there is the Densha Otoko series but it's already there, and it's not even an anime, if you know of any anime put it here
Meaning what exactly?
Do you want something centered around the use of a BBS?
Steins;Gate touches a bit on @channel which is clearly just 2channel. I wouldn't say that it's heavily centered on any BBS though.
>>5
The anime Steins Gate isn't as good as the VN. Its not heavily centered on it, but its key to a bunch of characters meeting and the whole John Titor legend comes from a BBS. 2channel appears a lot in anime from the 2000s (e.g. Konata using it). I don't know if there are actual anime focused on it. There's Suicide Club which is loosely about 2channel's suicide board.