While I’m not a big Twitter user, I do use it on occasion to ask questions of the experts. Below are some tips I’ve found.
– No Special Characters – anyone can see this tweet.
– When you start your message with the @username, then the tweet is visible to the person you are sending it to and any users who are following both you and that person. It’s not exactly a private message, but close to it.
– If the leading @ is preceded by any other character, commonly a period, the message will be visible to anyone following you.
This indicates thats you are retweeting someone’s message. Doing so makes the message available to all your followers.
Any words in the message which begin with # are called hashtags and are used to tag the message as related to some particular topic.