Facebook

Facebook ( originally called 'The Facebook' ) began to really kick off around 2009 and 2010 especially in Ireland. It was founded by Mark Zuckerberg, Eduardo Saverin, Dustin Moskovitz and Chris Hughes in Cambridge, Massachusettes in the United States.
 It began with the website's membership being exclusive to Harvard students and then began to spread around that area, the founders then new they were on to something huge when they started to sell advertising on the website for hundreds of thousands of dollars.
Facebook went from being exclusive to a few schools when it launched in February 2004, to having over 800 million active users across the globe in July 2011, the oldest woman to join was 102 in 2008.
Facebook has been blocked intermittently in numerous countries such as Vietnam, Pakistan, Iran and Syria for different reasons depending on the country, for expample in many countries it was banned due to religious discrimination being posted without any consequences. Facebook's privacy is also and on going problem due to the fact that the settings are not automatically private.