Direct Messaging is a feature on Twitter where you can send a private message or tweet to a person who is following you. It will only be visible to you and the person to whom it was send. Twitter only allows you to send DM’s to one person at a time i.e. you cannot send DMs to more than one person simultaneously.
But a website called TweetGuru allows you to do so! To do so, first go to the TweetGuru website. Login to your Twitter account from their website. It uses OAuth so you wont have to enter your Twitter credentials.
Once you login, you will see the following screen.
Now enter the Twitter usernames in the IDs box separated by commas and enter the message in the Tweet Message box. Click the Send Multi DMs button and you are done.
Head over to TweetGuru Website if you need to send multiple DM’s on Twitter!