Social Networking Sites to gain backlinks:
Social Networks are large for business as you can reach to a bigger and much more specific audience that what you could with print media or television advertisements, also social networking could be monitored, so you can now see who’s really reading your posts and hitting your advertisements.
Society in general is using social network sites to meet people who have similar interests. If you possess a hobby for example collecting old coins, you can now join several other old coin enthusiasts and share tips, tales and make friendship that may serve you for a lifetime. Posting quality content on social networking sites is one of the good ways to get backlinks.