In Twitter, if you reply to someone, who is your reply visible to?

[encroach Ramos]

Is it only visible to that person that you reply to? Or is it visible to everybody else that goes onto that persons twitter?

[Lesley]

if you @ them, everyone will see. If you suggest they become one of your followers, then you can communicate privately.
good luck!

[evident]

When you @Username reply someone, the result is available to be viewed by anyone reading your feed, anyone searching Twitter and, if the user you @replied to replies, anyone who clicks on "in reply to" under the message replied to. So, no, it's not invisible.

Direct Messages on Twitter can only be sent to friends, but are visible only to the user you sent them to.