As mentioned in a recent post, the Twitter App for Windows 8 came out. I installed it on my Lumia 920.
Not a disaster or anything at all (I mean, at all), but the blue bird logo did disappear from the Start Screen tile. Oh no! I had no idea how much it means to me (sniff).
Resolution? I removed the App from the screen by holding the tile with my finger for a few seconds, and then hitting the pin. This takes it off the Start screen. Swipe right, go to the Twitter app, hold it down for a few seconds and select "pin to start".