Interesting article linked below. Personally I find the legal theory the board used to ban Groupon to be pretty weak. Never the less it is interesting as it may represent the tip of a new reactionary attack on Groupon and by extension social media and how it affects professional practice. On the other hand it may be limited to Oregon; they see things differently up there.
It is also illegal to pump your own gas in Oregon.
The Oregon Board of Dentistry has banned the use of Groupons by the states dentists because they run afoul of some “no commissions” rule
PS: Don’t you feel safer knowing the government is taking care of us like this.