How to DM on Twitter
Twitter uses its own lingo, including words and phrases like "tweet," "Follow Friday," "@mention" and "DM." DM refers to a direct message which, unlike a reply, is private between two Twitter users and does not appear in your Twitter feed. Direct messages are, however, limited to 140 characters, just like tweets and replies. You can send direct messages to anyone who follows you through your inbox on Twitter.
Navigate to Twitter.com and log in to your account.
Click the "Messages" in the top menu of your homepage to access your direct message inbox.
Click the "New Message" button. You can send a message to anyone who follows you.
Type the name of the person to whom you want to send a message. Twitter will show pop-up suggestions as you type. Click the person's avatar.
Type your message into the field. Keep in mind that, like tweets, the DM on Twitter is limited to 140 characters.
Click the "Send" button to send your direct message.
Tips & Warnings
- You cannot send direct messages on Twitter to people who do not follow you.