Yahoo! couldn't resist fucking with Flickr, though. Or delicious. Think about the damn tying it to freakin Yahoo! accounts, which look like they're out of the stone age, and the "you have to log in every 2 weeks to save a bookmark" feature they added to delicious, etc., etc. etc.

If people fuck with Twitter like that, it'll be gone. Service instability is one thing. Adding so much friction is another.