Sales/Marketing Collateral, website content, social media

I am looking for the marketing/sales collateral building of an IT services/staffing company. the provider must have following skills (1) Experience in building marketing/sales collateral for IT services and staffing company (2) Experience in blog writting, social profile building for the employees of the company ( linked in, facebook,twitter etc.,) (3) Experience in producing audio and video testimonials from the clients and publish them in the company's website effectively to generate interest from prospective clients (3) Knowledge in different technology areas is highly desired but not mandatory ( like business intelligence, Healthcare and staffing etc.,) PLease respond back with your past work details, if you find this project interesting. Thanks!