That's it. I'm out. Twitter has lost most of its utility for me over the past several weeks. It's like feature whack-a-mole. One day replies are disabled, the next it's the “older” link. IM is pretty much always dead. I have been ramming Twitter down everyone's throat since before it had an “e” in the name, but I quit. Between the whack-a-mole game and the FAIL whale it's not worth it.
In the meantime, Friendfeed is pretty much always working. And they actually add features instead of the other way around. See you there.