Sorry to hear you may have gotten a virus from Facebook. Most likely it was from some link that was posted there. You might want to try to downloand and add Malewarebytes anti malware software from CNet.com Just google Malewarebytes free. It finds and kills most if not all maleware issues. Also, AVG free or the full paid version of AVG is about the best virus and internet protection on the web. Just google AVG Free and download and install. I am certain it will find and kill any virus on your computer.

Good luck.
Dave