We can't compare these two because they both are different, google is used to search & facebook is used for social networking.so both are best depending on what you want.
Google is the best Search Engine and Facebook is a very popular Social site both are important. Yet I like Google very much.
I like google for searching new things and facebook is the best social network that fill our all needs whether its chatting , tagging , posting , sharing . So both are good and we cant live without both.
I choose Google because it gives various spaces to make online activities, so my activities become easier.
I like both, but my first choice is google and second choice is facebook. Today's day google plus is also a great network.
I like Google for search, mail, and more information And I like Facebook for chat but anybody say me who is the best site Google & Facebook? My answer is Google.