How Contests Can Create Long-Term Engagement with Users on Facebook

[Editor’s note: We’ve been covering a wide range of contests on Facebook Pages over the years, as brands, non-profits and many other organizations have used experimented more with ways of gaining fans, then growing the relationship with them. In the guest column below, Kevin Tate, cofounder and principal of social marketing company StepChange Group, details the types of contests he has seen work — or not work –s with Facebook users.]