<p>They are a staple of social media.</p> <p>The latest that I received warned against a ‘new’ scam when you check into a hotel.&nbsp; You’ve handed your credit card to the reception desk who take from it a deposit against which they will debit any extra charges for wildly overpriced miniature booze in the minibar or the laundry fee for your unmentionables.&nbsp; You get your card back and go to your room.</p>