Users on a politics-focused section of the fringe 4chan message board repeatedly posted the phone number for the Iowa Democratic Party, which was found by a simple Google search, both as screenshots and in plain text, alongside instructions.
…Several officials at caucuses attended by NBC News reporters struggled with lengthy hold times that made it impossible for them to report results.
4chan, which hosts an anonymous and often extremist politics board called /pol/ whose users have largely supported Trump since 2015, is known for extensive online political trolling and targeted harassment campaigns.
On debate nights, 4chan users often direct one another to swarm and manipulate specific online polls on other websites with repeat votes, a practice known as “brigading” in online communities. The polls would then be used by politicians and partisan websites to claim shocking upsets.