Whether or not this is what happens in practice, the purview of an IRB in the US very much is supposed to cover this situation. IRBs have intentionally broad mandates and cover quite a lot of things that most people would not immediately recognize as 'research' or 'experiments'.
> to raise awareness of the fact that what you put onto the Internet is public.
Most technical people consider 'doxxing' to be bad. However, in most cases, 'doxxing' is simply publicizing information that is already part of the public record[0]. There's a difference, based on the barrier to accessing that information.
[0] If I know your name and your city/state of residence, it's trivial for me to obtain a copy of your driver's license or voting registration information FOIA/FOIL requests typically charge a nominal processing fee to cover the costs of processing the requests, but only because it's a largely manual process, and the marginal costs of requesting many records at once is very low.