This tip will help you get the most out of Twitter. Remember if that you start your tweet with an @, it won’t go to your feed. It’s like speaking to someone one on one at a networking event. ONLY you and the person beside you within earshot (or those who follow the same handle) will hear or see the tweet. When you put a character, even as small as a “.” before your @, it goes to everyone who follow you.
— Teach a CEO (@TeachACEO) January 21, 2014
Extra Credit: A direct message is like whispering to someone at a network event.
Extra, extra credit (image via Gary Vaynerchuk):