Lot's of companies compete in lots of sectors. If you buy a Ford van you're not going to go to chevy. But that doesn't change the fact that Ford's primary busin

Lot's of companies compete in lots of sectors. If you buy a Ford van you're not going to go to chevy. But that doesn't change the fact that Ford's primary business is normal cars and chevy competes in that industry. If I ask who MS's biggest competitor is it's Apple. If I ask whose Google's biggest competitor it's probably MS Bing. Facebook is overwhelmingly known for its social network and it's biggest competitor is probably twitter who problem has ~10% of it's customers. The point is that none of facebook's competitors come even close to facebook's size no matter which portion of Facebook's core functionality you're talking about. Plus, facebook is not diversified in the way that SAP or Honeywell is.