[drupal-support] can drupal do yahoo groups?

[Nicolas Tostin]

Have you looked at Organic Groups ? http://drupal.org/project/og
I think this project is one that should best fit a Yahoo Groups like.
However, you may need to devellop some missing features, so feel free to get
in touch with them. I don't know the project so much as I don't currently
use it, but feel free to ask more support there.

Regards