Zurker is the only social network owned by its members. Not only do you own your content on Zurker, you own part of the actual social network itself! Members get vShares (a stake of ownership, or equity) in Zurker for referring their friends (without which a social network doesn't function anyway).
As more and more people use Zurker and the project grows, your stake in Zurker becomes more valuable.
Giving equity to members may sound like a radical idea, but it's only fair. Members should stand to benefit from what they bring to life - a social network is nothing without its members.