Facebook is now 200 million members strong, arguably phenomenal growth since the site's launch as a campus tool 5 years ago.

Facebook boss Mark Zuckerberg has blogged the occasion, while the company's PR agency says that "the Facebook community is so large in fact, that if Facebook were a country, it would be the 5th largest in the world".

Zuckerberg's blog post appears at pains to point out the more serious side of the social "notworking" site:

"From the protests against the Colombian FARC, a 40-year-old terrorist organization, to fighting oppressive, fringe groups in India, people use Facebook as a platform to build connections and organize action".

Zuckerberg states, "We are working hard to build a service that everyone, everywhere can use, whether they are a person, a company, a president or an organization working for change".

In the post it's revealed that a new space is to be created on Facebook "where people can share their stories about how Facebook has helped them give back to their communities, effect change or connect with a distant relative".

Users will still be able to poke people and post comedy pics too.