When I search Few keywords I see some results from social networks. So it would be considered as back link to those keywords?
every back link is count as a specific value... search back links like >> esparkinfo.com you will get quality back links.. find out competitor back links & generate it..
Whatever result you get for your site from other site that is in terms of backlink itself. Backlinks are very important for any site to get the traffic and it can increase our serp ranking also. But go for quality links instead of quantity links as quality backlinks can provide more effective result. And there are many techniques available for getting the links.
Every link is a backlink. You can check your back links searching on Yahoo search Engine use :- link:url
Every link you get is considered as your back link. It does'nt matter from where you are getting this.