He suggested that users may need to get more selective about approving friends requests.
"Friending one wrong account can lead to a domino effect of infecting a large branch of Facebook friends," he said. "For its part, it may be time for Facebook to increase the friction of connecting with people outside of your network to make it harder for widespread attacks to proliferate.”
Some security experts were also concerned about the increasing erosion of personal privacy.
"Now, besides everything else, Facebook also knows how you spend your money," said Guy Peer, co-founder and vice president of R&D at Dyadic Security.
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