Those good post comments and upvoting their own post are part of the comments abuse farm that has been ongoing since steemit. It is okay to downvote such Mac,I seldom use the DV button unless I see abuse such as plagiarism in the community.

There was also the initiative of @surpassinggoogle about @ulog which is blogging anything about U, anything that happened to U or anything that U experienced in a day.

I remember this there's also TIL hash before wherein you share some of the stuff that you learned this day.