Prosecutors say that's what Mississippi man Jason Smith did last summer, and that's why he got caught.
Authorities say Smith was rummaging around a U-Haul truck and rental service in Jackson in the early morning hours, when he took a moment to sign into the social networking site. Then, realizing he probably needed to cover his tracks, police say he came back days later and stole the computer he'd used.
The Carion-Ledger reports that after the apparent break-in, a company official told police a computer had been used and that Smith's facebook page was left on the screen. Five days later came word that the computer in question had disappeared.
Smith is charged with two counts of business burglary.
Prosecutors told a judge Monday that the facebook page is a key piece of evidence.
Smith's attorney, Katie Bradshaw, argued during his hearing that "anyone could have called up his facebook page," on that computer and that there isn't any hard evidence that he broke into the business.
Bond was set at $20,000, and the judge said there was enough evidence to send the case to a grand jury.