The computer doesn't belong to you. It belongs to someone else who is aware of the damage ignorant people can cause through sites like Facebook. Did you know that 20% of Facebook news feeds lead to malicious content?
If you want to screw up your own stuff, go ahead. You'll probably have to pay someone to sort it out later. In the meantime earn at least a little respect for yourself: get an education, learn how to spell 'Integrity' and make sure you understand what it means.
Someone fed up with disinfecting screwed up PCs, January 2011