Private tweets make your mention private
https://news.ycombinator.com/item?id=8568812URL : https://pvttwt.com
Private tweets are messages that can only be viewed by the people you mentioned
How does Private Tweets work? https://pvttwt.com/privacy
Why I use this site ? Because not all people in Twitter you know, and you can not get their mail. When there is a famous person, and you want to send him a private message, what do you do? Are you should follow everyone they follow you until they send you or you send him a private message? You can write a long letter in Twitter. You can not attach a file in Twitter If the message does not want to be seen by anyone and you can not put it in public. Private tweets will help you to do that.