Why are the reviews disappearing?
I am not sure they they might be disappearing, but several months ago there were some articles about how Yelp had essentially a pay-fer service to companies to make less favorable reviews appear lower on the list.
Nothing was mentioned about the removal of reviews though. I count 7 right now. 4 for. 3 against. I didn't want to mention it earlier because I didn't want to give Prosper any bright ideas ahead of time.