6. Words with Friends
Words with Friends is the Scrabble of the digital world. It first came out for iOS and the Facebook version came along the way. In the game you are basically given seven randomly chosen letters. New letters keep coming as you play but they are finite; you only get 104 of them.
Player are able to rearrange their letters, switch them out for new letters, or even pass their turn entirely. After three successive passes the person with the highest score wins unless the score for both is zero. The other way to win the game is when players have exhausted all 104 letters given to them. When this is done the player with the highest score wins the game.
Also in the game are random opponent and chat features, unlike Scrabble where you can actually talk to the person sitting across from or next to you. What that doesn't do is give you the chance to hook up with the word nerd of your dreams. Couples have found love through the game and one player's husband's life was even saved indirectly due to the chat feature.