Except we've seen a few tools come up on HN that claim to reliably tie anonymous profiles together via stylistic analysis.
Is google doing the same? Most likely.
Is it reliable? Less clear, given the Google ads page that show what Google thinks it knows about you is often mistaken on age and gender. Perhaps it's more reliable singling out an individual than an age.
When it was doing the rounds a couple of years back plenty of people were commenting how often it got age and gender wrong. Sometimes it was widly inaccurate on interests too.
Is google doing the same? Most likely.
Is it reliable? Less clear, given the Google ads page that show what Google thinks it knows about you is often mistaken on age and gender. Perhaps it's more reliable singling out an individual than an age.