Twitpic

This is another simple tool that lets you share pictures on Twitter. You can post pictures directly from your phone or a computer.

If you have a Twitter account then you already have a Twitpic account, just login to Twitpic with your Twitter username and password and you will be ready to upload photos.

To upload a new photo, click on the Upload Photo link. You can also post photos with your phone.
Easy!