Twitpic founder Noah Everett says he understands Twitter's choice, though he wishes it were a different one. "They're trying to control those eyeballs on their apps, they're an ad-based company, they make money that way." He says his site, the biggest of the bunch, gets a majority of its uploads from sources other than the official Twitter apps — a group, however, that includes uploads from 3rd-party Twitter clients, which account for about 23% of all tweets. - Leo Laporte