For internet marketing or marketing business, social media plays a vital role. Social bookmarking is very important for marketing your products. Facebook, Twitter, Pinterest, Instagram, Youtube, Linkedin are the most famous social media sites and also bookmarking sites. Among all of them, I personally prefer Twitter
because, from twitter we can get a good number of traffic. 
. By using proper hashtag while creating a twit, you can get more traffic within a few days. Facebook also provides you with more followers and likers but I think it will be not faster than twitter. 
Thank you