Are there any forums where people discuss and post links to online game sites and online games?

Yes there's lots.
Please read my signature for ideas

Yep, Google

"game name" AND forum and if it's a popular game, popular forums will be top hits.

What's your favorite game?

Quite a lot online. Miniball, wrecker, sherwood to name a few

My fav site is jayisgames.com

What are yours?