I have found networking events to be the most effective way to meet influential people who may be able to help you in your career. I have found job fairs to be a waste of time. My suggestion is to find out events that Facebook is hosting. Try to find out who from Facebook will be attending. Do some research on those attendees. If you get a chance to meet them at the event, do no talk about yourself. Talk about Facebook and the specific Facebook employee you're talking to. Let them know that you follow Facebook. Be genuine and personable. Wait until they ask you about yourself. Remember to bring a business card. (One with a photo would be a really nice touch so they can remember your name and face.) If they give you their business card, send a simple "it was nice to meet you at" email. Don't immediately ask to connect on LinkedIn. I personally hate that. If you made a positive impression, chances are they won't mind engaging with you. Cultivate the relationship. That's how they get to know you and keep you top of mind for opportunities.