By Walt Hunter

RADNOR, Pa. (CBS) – A Delaware County man was arrested for what authorities say he did to the photos of underage girls he “friended” on Facebook.

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Neil Geckle, 19, was arraigned this morning on child pornography charges and other related offenses.

According to investigators, Geckle downloaded pictures of underage girls he friended on Facebook.  Authorities allege that Geckle then defaced them with a sexually explicit picture of himself and then re-posted the pictures on the Internet.

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Police say Geckle posted four pictures online this way. Detectives say they also found 13 more pictures when they searched Geckle’s house.

Authorities say all of the victims were under the age of 18 and students at Radnor High School.

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Geckle was being held on $100,000 bail at the Delaware County Prison.