Recently in a California court, the defendant has made a motion to suppress evidence from various subpoenas to email, mobile and internet service providers, but included in the motion was a request to suppress a subpoena response from Craigslist regarding an ad posted by someone else. Directly quoted from the ruling:
The Government asserts that an individual posting an ad on Craigslist does not have a reasonable expectation of privacy in the content of the ad itself.
The Court further concludes that Defendant Rudtke does not have subjective expectation of privacy that society recognizes as reasonable in his Craigslist postings. A person has no legitimate expectation of privacy in information voluntarily turned over to a third party with the intent that the information will be shared with anyone with access to the internet.
So there you have it; no expectation of privacy in a Craigslist ad.
Court ruling referenced on Google Scholar. US v. RUDTKE, Dist. Court, SD California 2014
Disclaimer: this post is not meant as legal advice. Please consult an attorney for legal advice.