[handrous]

Well—you can @ their social media manager, anyway. Not much different than "calling your Senator" and getting some secretary in their office.

Though I'm sure some do actually use it themselves (Musk seems to, for instance)

[solarkraft]

A lot of them seem to and that's the big deal. Though they likely won't see your mention if they don't follow you.

[artfulhippo]

Verified Users get a separate priority queue; the real benefit of being a Blue Check is that other Blue Checks will see when you mention them.