Photo sharing allows photographers to learn from each other.
You determine the popularity of galleries by voting on them.
Just click on the Vote for this gallery link at the bottom of a gallery that you like.
There is no limit to how many galleries you can vote for, so vote for anything you like.
The purpose of the popularity ranking is so we can easily find galleries that other people think are worth looking at.
There are no defined criteria, but galleries with good technical or artistic quality will float to the top.
This is still new so there are not yet many votes.
Only votes from a recent period of days are shown by default.
Use the period links to view votes from the last N days, or all days.
Some filters are in place to prevent people from skewing the votes by creating many accounts just to vote on their own galleries.