From DariaWiki

Pitchforks are a PPMB in-joke where writers who leave unfinished stories are "jabbed" by their readers with pitchforks or other pointy objects in a jesting way, to encourage them to finish their tales. As an "angel in hell," Angelinhel initiated the use of pitchforks (usually flaming) on slow writers. Kristen Bealer is another PPMB regular known for enthusiastic use of pitchforks. Other fans use various other implements, such as Thea Zara, who prefers the whip. Variations also include using fanon characters, such as Bump (especially when "bumping" an old thread), in mini-scenes to deliver the hint.