I see a case where I can use this app like each minute, and I think is a niche that can be useful for you too: places.

A kindof trip advisor, but I guess that's also tricky because you will face the wall of the fake ratings.

The upvote feature although I see also why its behind login and the steps, maybe it will be worth to shorten also the process to upvote. Because as it is right now you will need a really committed community to upvote or downvote.

I will use this as a main search for a while when I try to find stuff and see how it behaves and let you know!