Untraceable (2008)

Operating within an exclusive unit at the FBI focused on combatting cyber offenses, Special Agent Jennifer Marsh is convinced she has encountered every form of criminality. However, her convictions are tested when a twisted perpetrator emerges in the virtual realm. Displaying a chilling level of technological prowess, this malevolent individual broadcasts real-time footage of his heinous acts on an online platform where the victim's fate is determined by the site's popularity. With time ticking away, Marsh and her colleagues embark on a race against the clock to apprehend the elusive murderer.