Good question , I am not sure , but i guess when you upload any post with those 5 tags it is displayed in those tags at that time, later those post get scrolled down , because many people post with same tags like nature, life, blog, steemit,etc.

Thats why people are much into increasing their followers , so when ever any post is posted by you , even if you post gets scrolled down in tags , but it will be shown on your followers home page. People always prefer to read their home page posts first then they look at tagged posts .

I dont know about Flags , But I would say what to post of such content by which your post can get flagged .

I dont know what is actual answer , but according to my observation this is how it works .