Since we were all talking about trolls the other day and specifically talking about Keliworth—-LA

asocalguy pointed out to me that though one can see keliwerth's comments one cannot see the comment history on his (?) kinja page.

I have run into this a few times when I've checked on comment histories of people following me

another example here, and one more here. With those two I cannot find any comments by them using a quick google search.

Any thoughts on how this is achieved?