As I'm a proper old git and way behind the times, I've just started playing
Words With Friends on Android and it has my nerd juices flowing.
For those even more behind the times than me, it's a free Scrabble game you can play (Android, iOs) by exchanging usernames, or by importing contacts if you connect it with Facebook etc.
Here be a thread to add one another if you're as big a nerd as I am. Post your usernames here if you want to be added and start games, or express your interest and PM each other usernames etc.