Formspring

Formspring encourages people to find out more about each other in a simple and fun way. It starts by directly asking people original questions in anticipation of their entertaining or revealing responses. Responses can range from straightforward to surprising and can lead to understanding something more about the people you know or find interesting. Whether you are curious to know more about a college you are applying to, the movies your friend likes, or the stories of someone you respect, on Formspring, you can have fun, share insights, and relate to one another in a new way.

More info at http://about.formspring.me/about

Icon: 
Code:
$links['formspring'] = array( 'name' => 'Formspring', 'description' => t('Share it on Formspring'), 'link' => 'http://www.formspring.me/share?url=<raw-encoded-url>&title=<raw-encoded-title>', );
Example:
Add to ListOptions