Google! The first most word for every software techie. Facebook! The first most word among students. Lets begin the battle between these two social networking giants.
Of course Facebook is the No 1 site in today's world  by traffic or anything(ad-revenue),but it won't help it to stand at the top. Google search engine algorithm is one time most popular word among the techies.Because its so powerful than any other in the world.Here i suggest some comparison between these.

Google:

1. The company was founded by Larry Page and Sergey Brin.
2. Google+ is where you’re more likely to engage with strangers.
3. When it comes advertising Google is at the top.
4. User interface.Both have equal points.
5. In security we can give it the 2nd place.
6. Apps tops first.
7. Uses PHP,MySql,HTML.

FaceBook: