In recent months there have been massive protests and demonstrations against autocratic rulers in the middle east and north africa. Many of these were possible in part because the protesters used social media services like Facebook, Youtube and Twitter to get the word out and let the world know what was going on. These services are so threatening to many governments that they're blocked in order to control their people. In Libya and Egypt's case, the entire internet was blocked.
Jehovah's Witnesses face a similar situation, although nowhere near as obvious or violent. The Watchtower for years has discouraged the use of the internet and social networking sites which are inherently a threat to its control. I remember older Watchtower studies that argued that we should always know what we're logging in for, then as soon as we're done (like checking email), log off from the internet. And now there's talks that warn us of the "dangers" of social networks. There are real dangers on the internet, which we should all watch out for. But, there are also dangers that are only dangerous to the WT. Be sure you know the difference.
Facebook is an unbelievably useful communitation tool. With over 600 million users and counting, it is the largest social network in the world. It is changing the world, like it has in the aforementioned places. I urge any active JW who wants to help others out of the WT organization to encourage them to join the zeitgeist. Who knows? Maybe we might have a rebellion of our own and leve en masse.