Swearing (judged by saying a word your grandmother would shudder at)
Twittering when drinking (as judged by slur in text)
Responding to your own twitter question
Responding to someone you follow when they don’t follow you (so can’t see you)
If responding directly to a person you must insert @ in front of the persons user name @smith. This way only people who are following both people involved with receive the Tweets.
But if you use @ you must place it at the beginning of the Tweet or it will still be forwarded to all your followers.