This is similar to what the IRS has been doing for a few years now. The IRS is allowed to review publicly-accesible social media profiles (but not to friend you or create accounts to get access to private data). I know someone who was audited and social media was used against him. He was self-employed and dealt mainly in cash and only reported $30k to the IRS, but they showed social media posts of his travels to exotic destinations, lavish purchases of motorcycles, jet skis, and checkins at expensive restaurants as evidence that he was earning more than he reported. He was able to beat the audit by providing credit card receipts in his girlfriend's name (she got the points, he gave her the cash), but the moral of the story is make your profiles private.