Bloging : Post Information about my site on blogs and social sites

I need a blog writer, who can post my website information giving the link that will lead back to my site. This should be done on more than 20 sites and blogs. The blogs and social posting must be done on blogs and site visited by US, UK, Australia students. You can also post on student groups. you will report to me with the links where you have posted information about my site. the payment for this is $4 so bid only if you can do it for $4 dollars. only serious people. thank you