so if you are signed up for strava.. there is this site:
http://battlerunning.compeople challenge each other over various distances.. it's actually pretty cool.
I didn't think the site worked initially - i signed up but i couldn't do anything.. I think it just was ingesting all of my Strava data, so that would understandably take a while. So apparently I was involved in a battle and didn't know it, and won it. jaja.
seems like fun.