Twitter is one of the world's most popular social networking sites and millions of people around the globe use it on a daily basis to post short updates about anything from their personal lives to business-related content. These short text-based updates are known as "Tweets," and you can comment on any Tweet even if you are not following the person who posted it. Commenting on such posts is a good way to strike up a discussion, make friends and gain more attention and followers.
1. Open your favorite Web browser and log in to your Twitter account with your username and password.
2. Scroll down your Twitter homepage to view all of the latest updates from people you've been following until you find the post that you want to comment on.
3. Hover the mouse over the post so that the various options, including "Reply" and "Retweet," appear in the top right of that post.
4. Click "Reply." A window will appear including a text box with the "@" symbol followed by the user's name in it.
5. Type in your comment after the existing text. Ensure that you leave a space between the beginning of your comment and the user's name. Note that "Tweets" are limited to 140 characters -- this includes the @ symbol and the user's name.
- Twitter is entirely public by default. Every comment that you leave will be viewable by everyone, including people who are not following you. Send a private message to the user if you don't want this to happen.
- Rainier Ehrhardt/Getty Images News/Getty Images