More than one million Facebook users could be affected by a malicious widget.
Researchers from security firm Fortinet have uncovered a malicious widget running amok within the Facebook social networking community.
The widget displays in the form of a "Secret Crush" request inviting users to find out who of their friends might have the hots for them.
But the widget acts as a social worm, prompting users to unwittingly download the infamous Zango adware/spyware application, and to recommend the contact details of five further friends to do the same.
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Those who have seeded the program within Facebook are cashing in, getting rewarded "per click", said Fortinet.
The widget is already being used by 3% of the Facebook community, Fortinet said, which amounts to more than one million users.
Fortinet has issued an advisory on the malicious widget.