Elance. com is a service provider that allows contractors to describe their level of satisfaction with subcontractors. this is an example of a /

I believe the answer is: distributor or sales agent feedback site

Agent feedback site refers to the site that allow the people who involved in a certain transaction to rate their experience regarding the transaction. The users in such sites tend to be able to post their feedback anonymously so they can post without risk of real live conflict.

a would be the answer

answer; ///any two strangers are likely to share many coincidental similarities;