My personal, subjective, non-official interpretation, based on my experience here over the years:
If you're submitting (a) link(s) to your own stuff everyday, it's probably going to raise eyebrows. If you submit your own stuff once a week, it's probably going to raise eyebrows. If you're submitting your own stuff once a month, I doubt anybody would much notice or care. If you're submitting your own stuff once every couple of months or so, you're probably fine.
Again, totally non-official, but I think that's a useful approximation.
