Today -  3/28 starting at 9 p.m. ET, Tide is launching the Tide Stain Release Challenge on Facebook. Remember, be one of the first 100,000 people to register at 9pm Eastern Time on Monday March 28, 2011 for the Tide Stain Release Challenge. Once registered, you’ll be able to reserve a free sample for yourself and three of your friends! That’s right you’ll be able to share with your friends.