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Gravity propagates at the speed of light, too.

I think that's a debatable topic.

Some say it is just a pure geometric effect of curved space (and thus instantaneous), not a force of nature that propagates.

The pure geometric effect propagates at light speed also (unless you want to discard relativity).

Then we can tug on gravity to send signals instantaneously!

Unless we discover gravity is bound to the speed of light too.

It is.

Spooky TCP

Someone get Vint Cerf on the line; this will make a fine RFC.