are we being observed?

I was here on SW yesterday and I mentioned scuba diving in a discussion with someone, now I'm getting scuba diving advertisement.

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MartinTheFirst · 26-30, M

You'll be noticing that whatever you wrote online will be considered in google as potential resources to get to you. If I talk about photoshop for a bit on here, then next time I write "how to" or "software" in google search engine, it will suggest something photoshop related.