What benefit -- if any -- businesses receive from daily deal programs is the subject of
much debate. If nothing else,
one unexpected advantage might be a boost to businesses’ search engine optimization efforts. So Andrew Shotland, local SEO consultant at LocalSEOGuide.com, told attendees of OMMA’s Search
Insider Summit on Tuesday. “I’ve heard of clients losing a lot of money on [daily deals],” Shotland said. However, the deals can make for an “interesting” search engine
optimization strategy, he noted.
Gavin, here's the article that discusses how Groupon can help with linkbuilding:
http://www.localseoguide.com/forget-linkbuilding-do-a-groupon/