It looks as if the plugin isn't compatible with WPMU/multisite. I can activate it sitewide or use a plugin manager to let individual site owners activate it. However, it appears that the sprite generator creates a new sprite any time a user saves his/her plugin settings...and that sprite messes up previous users' settings. For example, a user might end up with four Facebook icons in a row.
We'd love to deploy this on a network/multisite system. Is there any way to do this?