I like it when they do that because then I get a warning and do not accidentally get into their way.

Haha. This has happened to me many times when they accidently move to the side you tell them you're on. I would suggest definitely saying something as sometimes pedestrians change direction and do not know a biker is behind them. It only happens on occasion that they move to the side you tell them you are on.

Its a funny phenomenon actually because whenever a biker says "on your right/left" my mind automatically goes the direction that they said, even though that's the opposite of what they meant. I would honestly say that if its one person, just navigate around them to avoid confusion. If its a group of kids, then you should probably say something.

I prefer that if i dont look behind and they notice that i am focusing on something else for them to say on your respective side

I prefer that bikers on campus just get off their bikes and walk since it takes ten minutes to get from one side to the other

as said before, bells are the best way, even though you get some odd looks. they think bike and always move over, even without looking.

I like them saying on my left for some reason because I want to be on the right. But bikers on campus are pretty annoying cutting through massive traffic.