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Facebook says it is looking into reports that #*$!ographic and violent images have been posted to its website.
The pictures are reported to have shown up in users' newsfeeds.
According to the technology site, ZDnet, the material is being spread via a "linkspam virus" which tempts members to click on a seemingly innocuous story link.
A spokeswoman for Facebook said: "[We are] aware of these reports and we are investigating the issue".