Thanks for the reply Jennifer. it means Facebook is the best source to drive the traffic to website . will you tell me what about other networking sites like Google+, myspace , linkedin and other .are these are not good ??????
I didn't say that other social networking site are not effective. I just based my answer to my google analytic information. my approached to google+, twitter and facebook are same, there are high chance that your link pointing to your site will be click on facebook rather than twitter.
Facebook in general category, simple to connect with some one. Twitter to make a professional conversation. Both are great. For business purpose Twitter is better than Facebook.
From a business perspective it depends on what industry you are in. For some, Facebook might be the best, whilst others may find that one of the other networks is better for them.
Now a days twitter has become one of the most popular social networking site with almost 250,000,000 - estimated unique monthly visitors.