With Facebook (NASDAQ:FB) shares up over 50% since its earnings blowout, it's understandable for potential investors to be a little apprehensive about getting involved at these levels. After all, the social networking giant's market valuation is now just shy of $100 billion.

Fool contributor Steve Heller thinks that as long as you have a long-term mindset, preferably with a five-year or greater time horizon, Facebook remains an attractive investment. In the video below, Steve lays down two reasons why Facebook likely has a lot of untapped growth potential ahead as it finds new ways to monetize its massive user base.