All the three social networking sites are best, you can any of them to increase the popularity and visibility to your account. But from all the three Facebook is the most interesting one and most of the persons are using Facebook only.
I like Facebook But i prefer Google plus because it's best for SEO also Boost your website ranking....
comparision of facebook, google+,twitter does not make any sence, its just similar that you are comparing sir don bradman with sachin tendulkar, both are best in their own place. Facebook with millions of users, is large social network, Twitter means you can share clever comments and content,which is called "micro-blogging" tool, Google is offers a wide range of online business applications and the powerhouse of search. so you can utilise any one as per your requirement and policy of your blogs/site.
I think now Facebook is most popular but in coming days Google+ will replace on Facebook. Twitter is also getting more popularity day by day.