The best advice I can think of is to get involved with open-source. You'll learn a lot by working with your peers (some of which may be even at Facebook and oth

The best advice I can think of is to get involved with open-source. You'll learn a lot by working with your peers (some of which may be even at Facebook and other companies) and you'll figure out what you need to learn. You'll also end up with code you can show, and evidence of being able to work in a team and complete actual tasks. This is huge for prospective employers.