It's a great idea, nowadays there is no competitor to Google who can dominate them. Still, at least Facebook thinking to build search engine then it's a nice for us - If they build a search engine who can compete with Google even more advanced than them then definitely Facebook beats them as they already are at the top position in social media networking.

There are lots of chances to Facebook to beat Google by developing search engine algorithm more effective and productive than Google.

Google is always rock, So no one will beat google. and at the same time facebook too much strong with social networking. Google+ cant to beat facebook.

google needs some competetion, they are dominating and encroaching on other peoples turf, time some new company trys to even things out in search

comparision you will find here.

Seem's to me that their is enoughf room here for both internet giant's here! I use both almost everyday.