Net worth or stock as it's more easily understood as is a measure of the total amount of time you've put towards the site browsing pictures and funny videos compared to the total pool of time spent on the site by registered users. Let's say there are 1,000 registered users and they spent a grand total of 500 hours on the site. If you spent 10 hours on the site yourself alone, that's good enough to bring your stock to 2%.
While we're still hammering out the details, stock will work in conjunction with cash to make up your "net worth." You'll be able to eventually unlock features on the site, have more control over the direction of the site, and cash in on some prizes. We'll keep you posted.
Oh and, sorry kids.. you won't actually own a percentage of the site but wouldn't life be great if it were that easy? Send us your thoughts and suggestions.