Social media manager for Facebook, Twitter, YouTube, online forums, etc.

We have several company Facebook, Twitter, and YouTube pages as well as online forums and we are looking for a social media expert to manage them. The aim is to get more followers, Likes, +1's; as well as others linking to and sharing out our content. Likes and followers may NOT be purchased. Additionally, we'd like to increase engagement on our forums. The forums are to help grow our fan base as well as host beta testing programs for our apps. We need help recruiting beta testers from as many Mac, iPhone, iPad, and Android fan sites / forums as possible for some upcoming app releases. Forum posts will need to be moderated. In addition to managing social media pages, the social media manager will have a major role in moderating our forums and helping to get the word out about our beta test programs. The social media manager will interact with our fans and grow our following, which will result in links being shared and more traffic generated to the main site as well as aid in its rankings. The right candidate must have previous experience of managing social network accounts.