Wordpress to Social Media Network crossposting plugin Needed

Hi Bidders, We need an efficient wordpress plugin developer to develop a plugin which will crosspost blogs whenever a new post is published in our blog site. we have already a plugin but it stop posting sometimes and not reliable so the plugin we look to be reliable and entirely promote our site links. No hidden codes. Facebook, Tweeter, Stumbleupon, Digg, Delicious, Linkedin, Orkut, Reddit, technorati etc Must be working without any problem and easy to use plugin. Use "Read and Understood" in your bidding so that i know that you read the description and serious bidders. Happy bidding Anand