Ratings and reviews
Have user-submitted ratings and reviews of listings.
We are considering adding ratings and reviews. Agreed VM and Great Nonprofits are useful models in this space. Thanks for the suggestion and feedback!
Robert Rosenthal commented
VolunteerMatch.org and GreatNonprofits.org are both useful models for this. At VM, we have more than 2,000 reviews recently submitted by our volunteer members.