The world's most-used social networking site continues to grow, with Facebook announcing recently that they have managed to subscribe over 250 million people. CEO Mark Zuckerberg took a moment to post a blog update celebrating their achievement, at the same time shedding light on future goals the company has set for themselves. At a quarter billion they have more than twice the number of users their most direct competitor, MySpace, has and their growth has been rapid to say the least.

Where is Facebook going from here? More mobile development and tighter web integration is clearly on the schedule, as Zuckerberg specifically mentioned that some of their growth has been attributed to features such as Facebook Connect. Included in the blog posting is a map indicating the scope of Facebook users, which stretch across the entire globe. How long will Facebook be able to maintain this growth? It would also be interesting to know how many of those 250 million users are actually active.