Ever wonder why some people’s profile pictures show up alongside comments they leave on other blogs?
Gravatar associates your email address with your profile pic. Other sites (such as WordPress blogs) can then query the Gravatar service and say, “Hey, I have this email address…you got a picture to go with it?” Some WordPress themes and plugins, such as many of the ones from WooThemes, use them, too.
Setting this up takes just a couple of minutes, so head on over to Gravatar and create a free account. (If you already have a WordPress.com account, you can use that to log in). Then follow the steps to specify an email address and a profile pic to go with it. You can set up multiple email accounts (each with a different picture, if you want), so you only have to create one Gravatar account. Nice.
Even if your own site doesn’t use Gravatars (I’m looking at you, Blogger), it’s still a good idea to set this up for yourself — so when you leave comments on other blogs, your smiling mug will show up right along with them.