Are WPMU Dev messages visible in subsites?

Hi,

I'm seeing the following message in one of my subsites:

"Stay in the WP loop by following us on Facebook, Google+ and Twitter, and never miss out on great plugins, themes, offers, discounts or important security news!"

Is this visible to me because I'm super-admin or is it visible to all the other users?

I've tried logging in as a regular admin, but I can't quite say whether I'm not seeing it because it has been hidden by the plugin (due to having been viewed already?) or whether it's because I'm not super-admin.

Thank you for your time,
Mari