You can flag a Craig's list ad....I've done it numerous times for fake high-end sewing machine scams with prices too good to be true, with person not in my area so can't view, but willing to ship! Definitely beware...I've also flagged some Ebay listings for sewing machine listings that were scams (pirating someone else's account and putting their own add within the listing.."must e-mail me directly" type wording. Have to be careful everywhere.