Before you click "purchase" on a Black Friday online deal, you may want to think twice.

Black Friday is expected to be one of the biggest shopping days of the year, with Americans forecast to spend $11.7 billion online, according to Adobe Analytics. Mobile shopping will drive more than half of all sales, Adobe estimates.

As millions of Americans search apps and websites for deals, experts warn that consumers should be on the lookout for fraudsters who will try to capitalize on the holiday shopping rush.

"Limited time only, gotta do it now, before it sells out, whatever it is. That whole sense of urgency is something bad guys love," Lisa Plaggemier, executive director of the National Cybersecurity Alliance, told CBS News Texas .

Fake QR codes, phony social media posts and phishing

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