a few FACEBOOK pages for cyclists in the DC Area...

Bike Law DC
https://www.facebook.com/Bike-Law-DC

lawyers for cyclists
cycling lawyers for cyclists and cycling related issues

DC NOVA MD Lost and Stolen Bikes
https://www.facebook.com/groups/dcstolenbikes/

DC Used Bicycle Marketplace
https://www.facebook.com/groups/dcusedicyclemarketplace/