[contravariant]

I'm inclined to agree with that definition.

But where on earth does deportation not constitute force?

[WalterBright]

I agree with deportation being force.

Consider if you employ a person to mow your lawn. If you no longer want his services, you can force him to leave your property.

If you're a guest in a country, any country, and do not comply with the terms of your visa, they'll deport you.

Twitter cannot deport anyone. Your beef is not with Twitter.

[tshaddox]

Consider a situation where I want to invite someone to visit me on my property, but some government also claims jurisdiction over my property and decides that person is not allowed to visit my property. Whose property is it again?