Dave Lakhani has been described as a "Marketing Genius","Business Acceleration Strategist" and "Multipreneur" by his peers and the media. He has been responsible for developing dynamic strategies driving record breaking growth and increases in sales in more than 500 businesses in the past 10 years. Dave is an in demand speaker, author and trainer.
And this is probably the best post you will read about whether Groupon is good for your business.
Does Groupon Erode Price And Is Groupon Right For Your Small Business? - Marketing - The Bold Approach Method