Hi @princekabir, and welcome to the forums.
It’s a good idea to have a look around the forums and use the search facility, to see if a similar question has already been asked. That way, you can often find useful answers without having to wait for others to reply. We have a lot of related topics here, so you might find it helpful to read some of these:
What do you do to get more Facebook likes?
How do you grow a Facebook page from scratch?
http://www.sitepoint.com/community/t/how-to-get-more-facebook-likes-website-viewers-etc/32215
http://www.sitepoint.com/community/t/linkedin-promotion/37851
http://www.sitepoint.com/community/t/facebook-vs-linkedin/92833
If you want more information about something you read, or have other questions, please feel free to ask.