On webmasters.stackexchange.com I have set no favorite tags. Recently questions with the tag
seo have started being highlighted as if it were one of my favorite tags (in a fetching light blue). Looking at my profile I've answered 69 seo questions, and it's my top tag. Is there a number of times I have to answer a question with a specific tag before it gets marked as interesting?
Or is there some other algorithm behind marking those seo questions as interesting?