Is Facebook secretly snooping on my photos to serve ads?

I’ve been taking part in an experimental drug study at the local Veterans Administration hospital. Now that the study is wrapping up, I thought it might be wise to take a photo of my medicine bottle for future reference. So, during a break in traffic on my way to my appointment the other day, I picked up my work Android phone and snapped some photos of my medicine bottle, like this one.

Until this blog post I hadn't shared this photo with anyone.

Until now I hadn’t shared this photo with anyone.

All seemed well until I logged into Facebook on the same phone yesterday. That’s when I was astonished to see this targeted ad show up in my Facebook feed.

Holy shit! What are the odds that Facebook would just happen to serve up an ad that matched a photo I took less than 24 hours earlier, a photo that I hadn’t shared with anyone? Call me paranoid but I can’t even fathom the odds that this is coincidental. I don’t post any medical stuff on Facebook, have never mentioned medicine or bottles or … anything. No keywords. There is nothing I’ve shared voluntarily on Facebook that could have summoned an ad that just happens to match a photograph I had just taken but never intended to share.
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