Linked-in is an unique social website which stores and update your professional information.
It is a very useful and resourceful site, everybody must register themselves here, I registered myself here 3 years before, I think one can get a good job opportunity with this, one of my friend went to abroad for job through Linkedin only. I was very much surprised.
Every company is listed here, people on top notch positions are registered on Linkedin.
I would recommend this site for better career and information. Upcoming vacancies and company;s new ventures, mergers will automatically come on your profile wall.
Just follow your preferred company and remain updated about its recruitment process.