So I found some strange happenings on my phone. I'm going

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So I found some strange happenings on my phone.

I'm going to post it in greenest because it's easier for me to comprehend what I said.

> about 1 or 2 weeks ago I was on /b/
> I clicked on a link while scrolling
> I accidentally downloaded a folder full of hentai that I couldn't delete until I opened it
> I use incognito mode for every single search I do (I like my privacy)
> today I check my phones history to make sure it's working
> I found that there were multiple sites that I didn't visit
> those sites were of things that I enjoy

What exactly is this?

Pic unrelated