Good point. The business model for this site is to help small businesses survey their customers and employees which needs to be the focus for promo material like tag lines, FAQ etc. The objective is to grow a paying user base who survey people with little insentive to spoof their responses (like voting multiple times), which negates some criticism like 'why would anyone provide an email for a frivolous poll'.
Sounds like a sales pitch, not a slogan. It's also too long. Just a thought.
Simply 'What does the world think?' might be better.