In researching an answer to a question about Christian Penn, I ran across something I had not known before and considered interesting about her father-in-law, that he was a Mayflower passenger (which I did know) and that he was executed for the murder of a fellow passenger (which I had not known). So I asked a question "what-mayflower-passenger-was-executed-for-murder" and answered it myself. The answer was voted down because it was a factoid I'd entered myself and the question was closed as off-topic.
I now understand I should not have answered the question myself based on "is-it-ok-to-ask-questions-to-which-you-already-know-an-answer" and the fact that genealogy is still in beta.
The closing for off-topic surprised me at first since it was clearly family history in my mind (a significant number of Mayflower descendants are descended from John Billington including a former US President) and I discovered while researching a genealogy.se question. Some of the discussion on 'history.se vs genealogy.se' focuses on ethnic groups vs individuals but this was an individual. It was off-topic so that implies it could not be improved to be on-topic (eg by including I found while researching information on his daughter-in-law Christian Penn and this might explain why not much is written about that family). So that led me to try to understand what facts belong and which do not belong, and asking this meta question so our FAQ could be improved.
What should we add to the faq "ask/don't-ask" so questions like this can be avoided in the future and closers can point to specifics in "ask/don't-ask' section of FAQ?
In general, I think all questions voted closed as off-topic should prompt discussions in meta and lead to improvements in FAQ.