November 8, 2013 4:56 pm Social Media's Impact on Witness Intimidation Philadelphia’s district attorney’s office is investigating the affect that social media has on witness intimidation. US & World Videos 1:32 Police search for man accused of kidnapping woman at knifepoint outside Bucks County Wawa 1:12 Police investigate a shooting in Elsmere that left a 17-year-old boy in critical condition 0:20 Officials investigate a deadly crash on the 202 Parkway involving a semi-truck 1:49 South Philly residents find ways to beat the summer-like heat, starting with water ice 9:46 Another NJ earthquake: The Lineup