"Share what you want, with who you want." Is no one else put off by that grammar mistake centered on their front page? I'm not a native speaker, but it sounds just plain wrong.
share WHAT you WANT with WHO you WANT
The only issue I have is that the comma indicates a break which seems unnatural to me. That isn't always bad if you're trying to emphasize two different thoughts but I think of that slogan as a single cohesive thought rather than two different ones.