I receive this “Groupon” e-mail message about getting $10 worth of Gelato for only $5 bucks (50% savings) yesterday (Sunday 10, 2010).  I buy the Groupon, then posted this fantastic deal on Facebook and Twitter.

I watched someone’s video that they posted on their Facebook wall and said that I liked it! (I really did like the video they posted!).

Two people said they liked my post on Facebook and one of the people commented, then bought the same deal I got on gelato at groupon.com!

This goes to show you that online marketing through social media works!