Member Ratings
There is a feedback system on FD where members can leave a rating for other members.
When a transaction is completed (item taken or received), the member who initiated the original post can rate the other member. It is via a 'thumbs up' or 'thumbs down' selection in the chat section of the site.
If a member clicks the wrong 'thumb' by mistake, they can correct that by clicking other other 'thumb'. So, for example, if the member has clicked a 'down' instead of an 'up', they can subsequently click the 'up' and the system will remove the 'down' and add an 'up'.
There is also a separate system-generated feedback facility, where members can see statistics of usage of other members. See Admin Feedback System for an explanation of how this works and what information it gives.