Right now you can only view the top 20 people for most messages, most likes, etc. However, I think it would be useful if those things were paginated so you could go to the lowest number. It would be 20 per page.
I don't think it does. It reduces the quality a little bit on the thumbnail which I expect on every thumbnail, ever. When I click the thumbnail to view the full image it will be in the original quality. If it's not because it's too big for the light box then I can click the arrow and view the real full image. Just saying, you can use the thumbnails and it really not effect anything in normal situations. I don't recommend using it for your professionally edited wedding pictures, but feel free to use it for bug reports and examples of suggested features lol.