If you're ever on Facebook, you may have played Lexulous or Words With Friends, or maybe both. Basically, they're both versions of the classic board game, Scrabble, with variations in the scoring and slightly different dictionaries.
Lexulous is played exclusively between Facebook contacts. It's not colorful or fancy, but has a chat function players can use to leave messages. The size is rather small, and players are ranked. You can play practice games, review your stats and past matches. There are game settings that allow players to adjust notifications and views of the board. The only ads are the ones around the page - nothing on the board to annoy you.
Words With Friends can be played through Facebook with contacts there or with friends who are mobile device users. This is a great feature if you have a friend like I have who should stay off Facebook to stay out of trouble, but is a worthy opponent. This game also has flashy graphics and sounds and an overload of advertisements. If you are playing multiple games, you will have to wait 5 seconds and click on the close option to by-pass the pop-up ads in the middle of the game board. Messages can also be exchanged in the chat feature.
I enjoy playing both these versions of the same sort of word game, but I may prefer Lexulous a bit more because it has less annoyances. It's the closest thing to moving around wooden tiles on a cardboard playing surface I've found online.