2) Never learning how to do a @ reply, you are missing viral effect & marketing advantage and leaving money on the table.

3)Sending repetitive messages that show duplicates on your profile, (also the same deadly sin is sending 5 messages at once), its unprofessional, do not do it.

4)Not uploading your personal photo to your personal profile, You are real you are a person use your photo.  Do not use alvin and the chipmunks, a book or icon, if its personal use your own Photo not some movie stars.

5)Using Twitter with no Background, Like not even having a front door on a house……….not done.

6) Having code showing in a message, (this could be html code or BBC code it looks ugly everyone knows what you were trying to do its horrible).

7)Not getting to know whom you are following; this could prove a dilema for your reputation if for example; Your a Child advocate and have a porn star follow you………..this connects you with a porn star……….do you really want to be connected and have your name associated with that topic?

This Sins of Twitter where produced to provide some unwritten laws of twitter that one must abide with.