redditors don't like that.
What redditors like or don't like varries widely. While it is true that there are a few redditors that will downvote just because they see something more than once, my experience shows that it is a small minority.
What i would try to do is to get something new to appear in three subreddits. And I would try to make sure that the three were different enough that the odds were good that most folks would see it once. The reason is that within a couple of hours, one would do well, the other two would do so-so. Usually one would go to something like 100 points and the other two would get to around 15 or so. Good enough!
As for advertising on reddit - I've already done that. Redditors appear to be trained to ignore the stuff in the advertising box.
As for what the stalker is looking for: clearly the stalker is unbalanced. The stalker attacks stuff that has exactly one post ever. Even stuff that is a reddit discussion - so no links to my stuff outside of reddit. While many people choose to have their decisions influenced by crazy people, I am not one of them.