Fox added some heat to pilot season on Monday, giving pickups to two high-profile dramas and two comedies.

The dramas are both from Warner Bros. TV. “Vampire Diaries” exec producer Kevin Williamson has penned an untitled project about a serial killer who uses social media to create a network of murderers as he’s being hunted by an FBI agent.

Marc Guggenheim and Greg Berlanti are shepherding “Guilty,” a legal drama centering on a defense attorney who takes on tough cases and seeks to track down the people who had him falsely convicted of fraud.

On the lighter side, “It’s Always Sunny in Philadelphia” scribes Rob McElhenney and Rob Rosell co-wrote the single-camera laffer, “Living Loaded,” about a hard-partying blogger who changes his ways when he becomes the host a radio show. Nick Frenkel exec produces with McElhenney and Rosell for FX Prods.

The other laffer is a single-cam vehicle from feature scribe Dana Fox (“What Happens in Vegas”), Chernin Entertainment and 20th Century Fox TV. Tentatively titled “Ben Fox is My Manny,” project revolves around a mother who hires her brother to serve as a “manny” to her children. Fox exec produces with Peter Chernin and Katherine Pope.