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Facebook cemented its position as the world’s leading social network, surpassing the 300 million user mark and becoming cash-flow positive ahead of schedule.

In non-accountant terms: Facebook is making money, the company said at today’s TechCrunch50 conference, an event focused on emerging startups. These numbers will show up tech industry watchers who have been looking for signs that Facebook has lost its momentum and, less measurably, its coolness on the Internet.

In fact, even though it’s already five years old, Facebook’s growth is actually accelerating. They added 50 million users in two months. (It took them 3.5 months to go from 200 to 250 million users).

The company also launched a Google Labs-like space called “Prototypes” where they can test out features that will slowly be introduced to the site at large. Some of the projects they’re testing out include desktop notifications (which would add some functionality that’s similar to Tweetdeck and other Twitter clients that automatically alert you when there’s fresh content). There’s also an enhanced event concept, that would sync with your Outlook account and calendars.

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