Which is better: Plum Groups, JCow or Grouply?\?

[Abby]

Don't know anything about Plum Groups or JCow, but I have had a great experience with Grouply, and it would seem to meet your requirements.

* Grouply allows you to upload music and share photos, files, and videos.
* Grouply has a full set of privacy controls, so you can make your group public or restrict access to just members. You can even make some pages public (to attract new members) and some pages private for members only.
* You can make the group invite-only if you want, so you can't even discover/join unless you are invited.
* You can use your own custom web address.
* There is no PHP or any other coding required. Grouply's customization interface is really easy to use. Just point and click.
* Grouply provides the ability to post status or quick "whiteboard" posts, just like on Facebook.
* Grouply allows full appearance customization, much more powerful than Twitter's.
* You can comment on any message or piece of content.