Are you saying that definition is not in line with what that term means in practice? What do you think "forced" means, if something quite different that?

Colloquially 'forced' is often used in a sense weaker than coercion. For example, a train delay might force you to take the bus. A move in Chess can be forced because all alternatives immediately lose. In this weaker sense, it might be taken as "left with no better option".

Yes, to force means to leave no alternative or option, and in this sense Facebook is not forcing those connections, and it's unreasonable to say it is forcing them.

So, in my examples, nothing forces you, in the strictest sense, to take the bus instead of walking. And in Chess nothing forces you in the strictest sense to not make a move that immediately loses.

So perhaps loosen your grip and understand what the OP was saying?