Thirty seconds of Internet research can reveal a lot about a person. If that person happens to be a buyer or seller in a real estate transaction, such a search could also reveal motivations and other personal details that you won't find in any contract or addendum—details that could hurt his negotiating position.

Buyers could post photos of a listing on Facebook along with comments about how desperate they are to have their offer accepted. Sellers might tweet about how they can't wait to get away from a bad neighbor.

If the other parties in a transaction or their agent sees these posts, your clients' negotiating position could be weakened, costing them money or even killing a deal. Tell your clients to keep their real estate transactions off social media channels. It doesn't take much effort to Google someone's name.