User blog comment:Garr9988/The Warehouse's Online "Fan Community"/@comment-31772644-20171026055058/@comment-31772644-20171026055806

Oh! The episode you're talking about was called "Love and Monsters", widely considered a franchise low point, and the group in question were all of people who had previous experince with the Doctor from an area he was known to frequent. They didn't become a hunting group until one more assertive alien convinced them all to, only because he wanted to absorb the Doctor.

Prior to that, in the very first episode of the revival, "Rose", Rose tries to find out more about the Doctor who she'd just met and finds a man who had become obsessed with him, and was convinced him appearing was an omen of DOOM (He was later killed by an Auton, so maybe onto something). But Rose thought his shed of photos and articles was crazy and didn't believe him.