After the redesign, links to groups were deleted (meaning they restructured the URL hierarchy and how one part of the site connects to the other). That's almost fine, as long as they implement a nice search functionality and allow access to hundreds of backpages of user-created posts for each city group, etc...only they didn't. They totally deleted all that crowdsourced data (the posts) and threw the search functionality in the trash (search is a horrible user experience now).

In summary, by crowdsourced data, I mean when someone asks where the best park is (for ex), they might get several viable answers from locals. After a few months, this post gets buried but with search it can easily be found again.