About me is a sidebar widget that displays icon links to your profile pages on other social networking sites. Based on Social Links.
I will add suggested sites in upcoming releases.
The 'add' button is linked to an ajax function provided by prototype lib. Some other plugins inject their own version of prototype, instead of using the one provided by WP, this result in a broken 'add' button.
If you are using Use Google Libraries plugins read this
From version 1.0.0 to 1.0.1 About Me widget has been renamed to 'About Me - Social Link', so you have simply to add it from the widgets page.