Is Twitter’s breakneck growth causing a backlash?

David Bill isn’t annoyed when Twitter gets so bogged down with traffic that he can’t post a message. That’s because in the moment when frustration would hit, he’s greeted on the popular Web site by a cartoonish image he loves: a giant whale being lifted out of an ocean by a small flock of tweeting birds. The icon — which Twitter users call it the “fail whale” because the creature appears only when the site has failed to load — has gained a cult following as the social media site grows at breakneck pace.