All social networking sites are good for getting visitors, but there is some social networking site which is more popular as Facebook, twitter, google plus etc. Use them for entertainment purpose. Social networking sites have many users so it is also good for advertisement. and you can also use them to redirect traffic to your website.

Facebook and Google+ is the best social networking sites for me..

I may depend on your need try different types of network then analyse , this will give you more clear view

Here are the best social networking sites:
1.Facebool
2.Twitter
3Linkedin
4.Pinterest
5.Google+

Facebook, Twitter & Google+ is the best

Best social networking sites are as follows:
Facebook.
Google plus.
Twitter.
Linked in.
My space.
Kiwibox.
Etc.....

These are the topper sites

Google Plus
Facebook
Twitter

I think that for the most of people the list looks pretty the same.
FB
Twitter
Pinterest
Google plus
Stumble upon

Google plus is the best social networking site. because at this time Google Plus is most popular site.

facebook, google+, linkedin, twitter these are best social networking sites.

All social networking sites are good if you want to get huge traffic to your website. Add more peoples to your profile for getting more likes and share. Some popular social networking sites are Facebook, linked in, google plus, twitter etc. I mostly use Facebook for entertainment and for getting traffic both. Facebook is thriving beast in between social networking sites. Facebook is top most social networking sites. I personally like Facebook more than any other social networking sites.