Snapzu Platinum membership adds unique perks, customization, and special access to any regular profile, as explained on the [Snapzu Platinum] details page. Credits can be acquired by:

A) Reaching certain experience levels (by being active)
B) Gifted by other members (for being helpful, entertaining, etc)
C) Purchased directly from Snapzu (to help out financially)

All premium perks work in a such a way to not compromise the integrity of the voting system and the fairness it plays in the community.