Social sharing sites play an important role to gain a large amount of traffic. It helps to increase brand awareness and get more leads without any extra cost. If you are active in social media it help to grow your product or any idea viral between persons.
Here are the best social sharing site list:
https://twitter.com
https://traiborg.com
https://www.xing.com
https://plus.google.com
https://www.pinterest.com
http://www.apsense.com
https://www.instagram.com/
https://www.youtube.com/
https://qzone.qq.com/
https://www.weibo.com/
https://ask.fm/
https://www.tumblr.com/
https://www.flickr.com/
https://www.linkedin.com
https://vk.com/
https://ok.ru/
https://www.meetup.com/