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Yahoo! Avatars
An Avatar is an image that you create to represent yourself online. You can change the clothes, accessories and hairstyles to reflect who you are and what you look like. You can also use your Avatar to express your mood.
Once you set up your Avatar, your friends can see it in an IM window.
Change your mood with Yahoo! Messenger
Avatars express how you are feeling because they respond to the emotions you use. If you send a 
emoticon, your Avatar smiles. When you send a 
emoticon, your Avatar frowns.
Enabling Yahoo! Avatars
Don't Share a Display Image
Share My Picture
Share My Yahoo! Avatar
Change Display Image
- Click the triangle below your display image
- Select Share My Yahoo! Avatar
You can also select which friends can see your Avatar. Just right-click your Avatar in the IM window and uncheck Share Display Image.