Location tagging is, in and of itself, another way to make you an attractive target to marketers. You're giving away information about which brick-and-mortar retailers you are likely to frequent, allowing for even more enhanced targeting.
So what are the limits when it comes to Facebook sharing members' personal data with advertisers and marketers? Do regulations prevent any of this sharing at all?
The issues are really being formed right now, said Allison Hobbs, an intellectual-property and copyright lawyer in New York.
"Social media companies should not engage in deceptive or unfair trade practices," Hobbs said. "As far as end-user data is concerned, that means social media companies should honestly disclose what they plan to do with it. Usually, they do this through their Terms of Service or privacy statements.
"When they are not honest, the Federal Trade Commission, which regulates deceptive and unfair trade practices, may issue a complaint against them," Hobbs said. "In 2011, the FTC issued complaints against Google and Facebook; the result was that both parties are required to do privacy audits until 2032.