Alternatively, cautious online daters can do a reverse image search on Google to see if the photo has appeared anywhere else online.
Mark Weinsten, a security expert and founder of privacy-focused social media site Me We, cautions consumers about giving up data by plugging apps into their social media accounts.
Blockchain is the technology on which digital currency bitcoin runs.
When somebody sends another person bitcoin to pay for something, the transaction is sent to a network of computers for verification.
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