Your country: UK
Reward types: Sweepstakes for cash only
Number of invites: regularly due to sofware use plus occasional surveys
Age to join: from 18 years
Prize draws: Monthly 1,000 GBP cash for 10 winners, stay active on the panel and enter a 2,500 GBP quarterly or 8,000 GBP annual (about 30,000 GBP total cash every year)
Comments: This is a Nielsen special panel (world's major market research institute). You need to install software, which permanently tracks what Web-sites you visit - online surveys may be conducted on internet usage accordingly.