Vanity is the background of this question, but here we go...

To prevent misunderstandings: this is not about the ask ubuntu newsletter, but the Ubuntu Weekly Newsletter (sent by Elizabeth K. Joseph).

###Since long I have been subscribed to the Ubuntu Weekly Newsletter. I never read it actually too well, until today. My eye fell on a subject in the mail:

People Contributing the best questions and answers this week:
Since at least once or twice, one of my answers was pretty generously voted on, I expected to find my name somewhere in older mails. I admit.. as vain as it gets.

Digging through the mails however, I didn't see my name ever, which made me wonder, what is the algorithm behind the decision to mention questions or answer as "the best"?

###What it is not:

• The votes on the questions or answer
• The activity on the question
• Ask Ubuntu Top 5 Questions this week

Since these are mentioned separately.

Therefore, I asked the newsletter folks, who directed me to the Ask Ubuntu script on Launchpad, which didn't help much. I was advised to ask it here, and so I do.

###EDIT A thorough search shows I was on the list a number of times, but the reason why puzzles me even more. Weeks with relatively high rank (e.g. in the example from muru's answer, #3, Feb 7, 2016 - Feb 13, 2016), I wasn't on the list, while I was on the list on e.g. 30-9-2015 (#34)