So I have never experienced it at all. But my wife, at least once a week will mention something random and get an ad for it. If it were just purely confirmation bias I should be seeing the same biases.

The last one last week she mentioned checking out a certain store 10 minutes later she got around to searching for it. Google auto completed “where can I” with find (whatever store she was looking for) It was the first time she had typed it in and it was dead on what we had been talking about.

It’s definitely not everyone and everything every time but it happens in awful lot for coincidence.