Admin Share (Global) Functionality

Earlier I posted about our need for a user mod solution. You can read that post here. That was the first big issue we're running into while making final preparations to move 90,000 members from Ning to BP. The second is the apparent loss of sharing functionality.

I know there are some good plugins in place for group messaging and newsletters, but this is all geared towards much smaller size communities. On our current Ning site admins can share content globally with all 90,000 users. We share approximately three items per day and it usually generates around 25,000 pageviews based on the destination (all three shares combined).

Any suggestion on how we can replicate this functionality on BP?