And it's all for charity.
Social media type Jennifer Leggio is not only running the Nike Women's Marathon for charity - she's also persuaded some top social media figures to auction their skills to raise money for Team in Training, the fundraising arm of the Leukemia and Lymphoma Society.
And you could get some real value by bidding for yourself or your company. Names on the block include Chris Brogan, Joseph Jaffe, Geoff Livingston, Aaron Strout, and Greg Verdino.
If you don't recognise their names, there is a short bio on the link above. I'll add in the appropriate blog links in detail when I'm not sat on a train...