Microsoft’s FREE T-SHIRT FRIDAY contest’ll begin on Fri, Sep 25, 2009 and’ll continue each subsequent Friday beginning at 12:10 am PT and ending at 11:59 PM PT until cancelled by Sponsor. Each Friday, Sponsor’ll conduct a Contest by inviting visitors to respond to a prompt via http://twitter.com/bing. Visitors will have until 5:00 PM PT to respond via a “tweet” to @bing with the #fsf tag to be considered in the Contest. Eligiblity:

You’re a legal resident of the 50 US and District of Columbia, and are 13 years of age or older; and You’re NOT an employee of Microsoft or an employee of a Microsoft subsidiary; and You’re NOT involved in any part of the administration and execution of this Contest; and You’re NOT an immediate family (parent, sibling, spouse, child) or household member of a Microsoft employee, an employee of a Microsoft subsidiary, or a person involved in any part of the administration and execution of this Contest.

More info: Bing Search blog