Real Id
Battle.net friends list cap raised to 200
If you had maxed out the number of friends you could have on your Battle.net friends list, you're in luck, because Blizzard has quietly raised the cap.
Want to use Twitter in WoW? You’ll have to turn on Real ID first
Though I admit that it took me at least 20 minutes to figure out how to set up and use Twitter in WoW, when I did get it working, it just worked.
