The FBI warns to be extra careful during the upcoming holiday season.  If an online offer seems too good to be true, it is usually a fraudulent scam designed to get credit card information and other sensitive data 

http://www.foxnews.com/us/2016/11/28/cyber-monday-scams-targeting-shoppers-fbi-warns.html

Crooks are out to ensure a blue Christmas for cyber shoppers, using an array of online treachery and phony deals that will net an estimated $1 billion this year, according to the FBI.  In a report titled “Tis the Season for Holiday Scams,” the FBI urged shoppers to be aware of increasingly aggressive and creative scams designed by criminals to steal money and personal information. Fake deals, bogus surveys and malware hidden in phony come-ons are all at a fever pitch today, as customers take part in Cyber Monday, the online version of Black Friday. “If a deal looks too good to be true, it probably, is,” the FBI said in a statement. “You may end up paying for an item, giving away personal information, and receive nothing in return except for a compromised identity.”

Before shopping online, the FBI recommends securing all bank and credit accounts withstrong and different” passwords. But shoppers aren’t just at risk on retail websites — the FBI is now warning to beware of social media posts and smartphone Apps.  “Beware of posts on social media sites that appear to offer vouchers or gift cards, even if it appears the offer was shared by an online friend,” according to the FBI statement. “Some may pose as holiday promotions or contests that lead to participation in an online survey designed to steal personal information.”