On Monday GNAA, an "established trolling group that makes a hobby of 'crapflooding' blogs and trolling media organizations for laughs," released a worm into the Tumblr universe and, for the better part of the day, the site was inaccessible (the bug reportedly spammed 10,000 blogs). It was a crucial reminder that even the biggest of websites are prone to breaches of security. More than this, though, the incident becomes a metaphor for the larger, conversation surrounding growing web empires like Tumblr, Facebook and Twitter: No matter how big you get, you're never too big to be taken down a peg.