In this question the author links to an article he wrote. He/she is honest enough to mention they wrote the article, but in other communities (e.g. MetaFilter) self-linking is frowned upon as it's easily rife for abuse. What do you think?
I think the overarching stack overflow policy of self promotion makes a clear OK for now.
Specifically it is one link where the self promotion is clearly disclosed. Second, the link is summarized for this forum so it's not a blatant SEO grab for incoming links - real effort was made to shape a serious question.
I would say if a user only posted links to their works (20 times and no other input) it would have crossed the line of not being appropriate. This seems like genuine A-OK behavior from my point of view.
My only objection to that question is that it doesn't seem to be squarely on topic for this site. What makes it about the great outdoors? The premise that more lead left in the environment is a bad thing, so that question is not being asked - it's a given by the OP so I'm voting to close it and migrate it to the firearms site. I'd expect a fairly big edit to make it on topic here and that may not be what the OP is asking.
It's a density question. In this case it's a user who has clearly contributed to the site overall. If someone starts an account and a large percentage of their posts are self linking then I would be more concerned.
then I think it is just fine.
I'll take 10% self linking over 90% wikipedia regurgitation any day.
So long as
Then I think this sort of thing is fine. The question in question has close votes because it doesn't meet the first criteria. As the comment say, it fits on Firearms.SE but not here (I, and I'm sure others, have flagged it for migration accordingly). I think a similar question that was on-topic here would be fine.