Social networking sites being used to trace fraud

USCIS and allied agencies responsible for immigration are using information on social networking sites (such as Facebook) to track the activities and postings made by immigration benefits applicants/beneficiaries for evidence of fraudulent activity. While, on principle I agree with deterring fraud, but the "big brother" stance of USCIS is deplorable. Beware folks - big brother is watching. Something you post even in jest may not be that funny in the hands of a govt. officer whose career is dedicated to finding fraud.