Please spend some time exploring its contents: the videos, the pronunciation, the possibilities it has. You have to register but it's going to take just a couple of minutes. There is an enhanced version that you have to pay for, but the basic one, which is free, will give you lots of material anyway.
Facebook, Tweeter...., they're everywhere and he hear about them all the time. But how did all this start? Find out in this three-part programme from BBC Radio 4: http://www.bbc.co.uk/programmes/b00xw14v
This is a BBC programme that helps people from around the world to improve their English. Someone has written the scripts and we can all take advantage of that. Try this one about poetry - and remember, there are more on YOUTUBE: http://www.youtube.com/watch?v=LNaDRZBrT_o.
Have you heard about the film `The social network´, about the beginning of Facebook? Watch the trailer and fill in the gaps, then submit your answers and see how many words you got right: Click HERE.
This is a fantastic site to practise listening. The activities come in three different levels so try with level 3 because the others will be too easy for you: http://www.podcastsinenglish.com/index.shtml
A great idea to help you understand English better is to subscribe to a BBC podcast and listen to it on a regular basis. Why not trying with this programme? http://news.bbc.co.uk/today/hi/default.stm