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I wasn't planning on covering this topic. It didn't seem worth my time to cover it, to be honest. I'm not too fond of it because there is only one Pokestop around my area so the tracking system doesn't really affect me. At least that is what I thought. It turns out it affects rural players, not to the point we can't even catch anything.
Before this rolled out; I wished I had a screenshot, there were several Pokemon popping up, not just your commons either in fact I have completed most of my Pokedex from my own house. Rare Pokemon just seemed to keep spawning, every time there was a migration, the Pokemon that use to spawn changed, and from there I was able to catch different Pokemon.
I'm not sure if this is the same for those who live in more populated places, I just know I went from catching several Pokemon a day, to not even finding any the next. Normally, this wouldn't be concerning, but it seems like Niantic keeps punishing rural players. Many times people have reached out to Niantic, trying to help rural trainers but so far it seems like they do the opposite of what you would expect. Let me know if you are having this problem too, hopefully, it's just a bug with the sightings tab but I'm not going to get my hopes up.
Update: I have now had the game up for 2 hours, the only thing that has shown up was a Magikarp... it wasn't a ditto :/