Just a suggestion. When you say you look at each photo, it'd be great suggesting something, at least a one liner to those whom you're rejecting and letting them know what they could improve. Me for example. I have uploaded 3 entries by now, with zero attention. Its okay not to get any upvotes, really. But I was just wondering what I was doing wrong while uploading stuff.
Good luck for the movement.
With hundreds of pictures being tagged with #photofeed each day, that would be a full time job to go through and comment on every single one! You're not necessarily doing anything wrong, there's just a lot of great competition. Keep on tagging us and hopefully you'll be featured one of these days!