You clearly aren't getting my point.
I'm arguing for 100 biased-perspectives over 1 biased-perspective
They probably aren't even reporting the final numbers in the local council election.
Assuming NextDoor's dataset is around in 100 years (probably not) there will be some topics well represented. But you are going to have huge gaps in others.
How many historical nextdoors are you aware of? For me, none. But is that because they don’t exist or just that no record survived? Social media is secret society.
Contrast that with the common public, who will of course not waste their time writing about or discussing matters that they do not have any interest in.
You will find no greater hive of scum and villainy than Nextdoor.