[julesstoop]

When using twitter from a web browser, as I assume you do, you won't see your own @Person's-page-you-visit tweets on their page (what you get when you click their name). They'll only appear from your own page. The messages do arrive though, don't worry.

Someone else who follows you won't be able to see those messages on the receivers side either, but will be able to see you sent an @Somebodyelse message if you're and the third person are both following each other, a.fa.i.k.

You can also send a personal message (sort of an SMS, essentially). This is something really only the receiver of the message will be able to read.