This is for Facebook users. I am guessing you could modify this idea to use it with other social media sites.
Iposted this on my Facebook status.
Creative Pay-it Forward. The first five people to comment on this
status will receive from me, sometime in the next calendar year,a gift-
perhaps a book, or baked goods, or a candle, music, art - a surprise!
There will likely be no warning and will happen whenever the mood
strikes me. The catch? Those five people must make the same offer in
their FB status. (I was #5 on Melanie's list, my daughter-in-law. I
think this is a great idea.)