Almost everyone has either a google, hotmail or yahoo account. I ask people to leave a review on whichever site the already have an account with. If the don't have an account with any of those then facebook is my fall back. Of course I'm pretty terrible about remembering to ask in the first place. I just got my 5th on google, I have a couple on yahoo, one on Facebook, one on angies list and the other day I searched my company name and found some site I had never heard that someone left a review on.
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