By default, Twitter doesn’t allow users to post direct messages to multiple accounts due to users misusing it as a tool to send spam to others. But what if you’ve no such intention and merely want to thank your friends who have sent you birthday greetings via public tweets? Well, there’s a handy tool out there that helps you do so. Created by a South Korean guy named Chris Kwon, TweetGuru enables you to message up to 12 Twitter users with one go. To start, simply head over to the site and authenticate the app with your Twitter account. Punch in the usernames of people (separated by commas) and your desired message in the respective fields, and you’re good to go!