The school district has yet to respond to the accusations, so at this point we've only got the plaintiff's side of the story -- for all we know this kid took a picture of himself and somehow accidentally uploaded it on the school network. Then again, some purported Lower Merion students just emailed Gizmodo and claimed that their MacBooks' green webcam lights went on at random times, but they were told by IT support that it was just a technical glitch. Holy alleged invasion of privacy, Batman, this could get mighty interesting. PDF of the complaint available below.
Update: The Lower Merion School District superintendent Christopher McGinley has issued an official response on its website, acknowledging "a security feature intended to track lost, stolen and missing laptops." Going further, he says the district " has not used the tracking feature or web cam for any other purpose or in any other manner whatsoever" but that the matter is "under review."