Here are some examples of today's deals from these social marketing sites:
Groupon is offering 57% off your purchase of five core classes at Row Zone locations in the Philadelphia area.
Living Social is offering $45 worth of food and drink at the Italian Bistro in Center City for $20.
Buy With Me is offering a 30-class punch card at the Moore Than Fitness Bootcamp in King of Prussia for $30, instead of the usual $187.
When you sign up for these sites, there's no obligation to buy any of the deals -- some of which last a day, some of which last a week.