If you read a lot of blogs, you’re probably already familiar with gravatars – custom images that represent certain commenters. These images are a kind of personal logo that identifies them and says something about their personality. Here’s how gravatars work. A commenter creates an image suitable for a gravatar and uploads it to his account on www.gravatar.com The gravatar is rated using pretty much the same ratings as the movie industry: G, PG, R, and X. If you participate in blogs by leaving comments for blog posts,
you should consider creating a gravatar. Its easy and its free. Here’s how: 

1. Go to gravatar.com’s Signup Page.
2. Enter your e-mail address in the box and click Signup. A message appears, telling you that an e-mail message has been sent to your account.
3. Check your e-mail. You should find a message from Gravatar.
4. Click the URL link in the e-mail message. Your browser opens and displays a message confirming that you have successfully activated your account.
5. Enter a password for your account in each of the boxes that appear and click Set Password.
6. Use your favorite graphics application to create an image suitable for use as a gravatar.
7. Save the image as a JPG, GIF, or PNG image with an Internet-friendly name (no spaces or weird characters).
8. Login in your account in www.gravatar.com.
9. Click the add a new one link.
10. In the next screen, click My computer’s hard drive.
11. Select and open the image file you created for your gravatar. The pathname appears in the File box.
12. Click the Next button. The file is uploaded and appears in the rating screen.
13. Click the appropriate button to apply a rating to the Gravatar. Don’t lie; this is important. And remember that for maximum exposure, it’s good to create a gravatar rated G or PG.

As you’ll see your gravatar changes globally wherever it’s used when you change it. From that point on, your gravatar should appear whenever you post a comment to a gravatar-enabled blog.