If you put in even a little effort to conceal your identity, it makes it very hard to find you.
But if you go around with your tattoos and face uncovered, and wearing uniquely identifiable clothing, any 4chan thread can find your identity in a few hours.
>>J5892+(OP)
The flip side is when 4Chan, (or Twitter, or Reddit) identifies you, it's not always correct. And that doesn't seem to matter to the angry mobs.
>>fortra+pl
That's neither unique to internet sleuths nor to angry mobs. LE will also on occasion misidentify people, and they + DAs also don't always stop that quickly.