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CHICAGO - Add "Facebook depression" to potential harms linked with social media, an influential doctors' group warns, referring to a condition it says may affect troubled teens who obsess over the online site. Researchers disagree on whether it's simply an extension of depression some kids feel in other circumstances, or a distinct condition linked with using the online site. But there are unique aspects of Facebook that can make it a particularly tough social landscape to navigate for kids already dealing with poor self-esteem, said Dr. Gwenn O'Keeffe, a Boston-area pediatrician and lead author of new American Academy of Pediatrics social-media guidelines.

The day after he replaced his Facebook picture with that of a shotgun shell, a Chester County man shot and killed his longtime girlfriend, officials said. Gregory Twyman, 44, was charged with murder in the Tuesday slaying of Jamica Woods in East Fallowfield Township. According to the affidavit of probable cause, Twyman called 911 and said, "I need the police. I just shot my girlfriend. " On Monday, the affidavit said, Twyman altered his Facebook profile picture to that of a shotgun shell.

Apple Inc. has 1 Infinite Loop; Genentech Inc. has 1 DNA Way. But Facebook Inc. now lays claim to Silicon Valley's premier vanity address: 1 Hacker Way. After journeying from a Harvard University dorm room to a rented house in Palo Alto, Calif., to a series of temporary corporate offices it quickly outgrew, the eight-year-old social-networking giant has set down permanent roots just in time for its initial public offering. Facebook, the hottest company to come out of the region since Google Inc., filed papers this week to sell its stock to the public.

I remember unpacking my belongings on the first day of my freshman year of college, waiting with my stomach in knots for my roommate's arrival. I wondered what she would look like, whether she would be nice, whether we'd have the same interests, whether it would bother her that I'm more than a tad messy. Lara Seligman, 18, has no idea what I'm talking about. The 18-year-old from Wynnewood, an incoming freshman at the University of Pennsylvania, has known for two months who her roommate will be - a "really fun, really nice" girl from Vienna, Va., who has lots of friends, parties occasionally, does crew, is into history, and has a great memory.

High school sophomore Thanasis Narliotis needed cash. So he spread some baseball team caps, old skateboards, a boom box, sunglasses, and a few shirts out on his bed and snapped a quick photo. Minutes after he posted it on Facebook with the caption "See what u want. Make me an offer," the bids started rolling in. Narliotis posted on "One Man's S- is Another Man's Treasure," a Facebook group dedicated to the buying and selling of the necessities of a teenage boy's life: video games, gaming systems, sneakers, headphones, T-shirts, sports equipment, and phones.

A20-YEAR-OLD Kensington man is accused of using Facebook to threaten witnesses who were to testify against his friends in a weapons case. Freddie Henriquez allegedly obtained a witness' statement and posted images of it on Facebook, accompanied with a caption that said "RATS. " Henriquez also posted other threatening messages on Facebook, authorities say. In an August post provided by prosecutors, he wrote, "KILL RATS point blank period. " Those threats came after four of his associates were arrested in February for an alleged conspiracy involving straw purchases of firearms.

After a bitter fight with her child's father, police said, a Southwest Philadelphia woman took to her Facebook wall and offered $1,000 to anyone who would murder her ex. London Eley, 20, didn't have to wait long. Timothy Bynum, 18, of Darby, soon volunteered for the job. The hit was never carried out, but police believe the plot was more than just idle talk. When officers arrested Bynum on Friday, they found a loaded .22 caliber handgun in his apartment, with the serial number partially obliterated.

State Rep. Mark Cohen hasn't racked up 40 years in the Pennsylvania legislature by taking his political opponents lightly. When he heard that Numa St. Louis, 31, an Olney educator, was planning a run against him this spring, Cohen discovered they were both Facebook devotees - St. Louis with more than 700 friends, Cohen with more than 5,000. Not only that, St. Louis had created a campaign page - Team Numa - and many of Cohen's colleagues in the state House were listed as Numa's friends.

BOUYED BY A Facebook campaign called "Guide Joe Home," thousands of students, alumni and fans lined the streets of State College for the funeral procession of Joe Paterno. The goal was to make a single-file "human chain" that would be along the side of the road and guide Paterno's hearse. More than 7,000 people wrote they were planning to take part. In many areas, the crowd swelled to four deep and more along the route, which went past Beaver Stadium and the library that bears Paterno's name.

SACRAMENTO, Calif. - A California man who trolled women's Facebook pages searching for clues that allowed him to take over their e-mail accounts was sentenced Friday to more than four years in state prison after a judge rejected a plea for a lighter sentence and likened the man to a Peeping Tom. Women in 17 states, including New Jersey, and in the District of Columbia and England were victimized. Once he took over their e-mail accounts, George Bronk searched their folders for nude or seminude photographs or videos sent to their husbands or boyfriends and distributed the images to relatives, friends, and coworkers on their contact list, prosecutors said.