Usability 
UK price comparison and shopping site. Registered users can review products and rate other user's reviews.
For some products, review authors can earn between 0.5p and 2p when another member rates their review as "helpful", "very helpful" or "exceptional". Members can also win prizes and money by participating in marketing surveys and by inviting friends to join Ciao!.
Microsoft acquired Ciao! in 2008 for $486 million and re-branded it as "Ciao! from Bing".