I find that stylometry is one of the easier barriers to overcome. For example, one pseudonym can persistently make a grammatical error ( e.g. failing to capita

I find that stylometry is one of the easier barriers to overcome. For example, one pseudonym can persistently make a grammatical error ( e.g. failing to capitalise proper nouns ) and another can use UK English spellings. And then there's the general 'vibe' of the forum which shapes how a pseduonym writes. If I were to write the same thing on HN versus IRC I would hope that the styles would be very different. What's really difficult is comparmentalising information, so that even on the same website two pseudonyms don't demonstrate that they have the same knowledge. Is it worth the bother? Possibly not, but I find it also makes me concentrate on what I'm writing.