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> by putting another person’s username at the start of a statement, it limits who sees it

Is this correct?

It limits who sees it in their default stream. Anyone could still go to your page (assuming it's public) to see your tweets that start with a username, however.

Fascinating - I never noticed that.

LOL, I think this might be a little bit ahead of its time. My mom still needs MomThisIsHowACellPhoneWorks.com

Why the u/vs?

It's not very good, it's not funny and it's not on topic. It uses weird things like @me without even explaining that @x means a username, @me means the author and is incredibly over verbose.

It's at times like this I wish I had a d/v still...

Mom, this is how Twitter works