Groupon's Andrew Mason:
> One particular clone in Australia called Scoopon, created by the brothers Gabby and Hezi Leibovitch, has been making life difficult for us. Scoopon went a little further than just starting their Groupon clone – they actually purchased the Groupon.com.au domain name, took the company name Groupon Pty Limited, and tried to register the Groupon trademark (filing for the trademark just seven days before us) in Australia.
There is also some coverage at [ZDNet], which has some answers from the brothers behind Scoopon/Catch of the Day.
They insist that they have been in operation since 2006 (which Daily Deals/Catch of the Day has in some form or the other, however Scoopon is a more recent venture by them, [launching only in April 2010][scoopon launch], which is well after Groupon's inception in 2008.
[ZDNet]: http://www.zdnet.com.au/groupon-details-aussie-trademark-stoush-339308316.htm "Groupon details Aussie trademark stoush" [scoopon launch]: http://www.smartcompany.com.au/sales/20100408-catch-of-the-day-launches-scoopons-sister-site-for-coupons.html