I thought we had a winner with this plugin, but we have had to revert back to Multipost MU By Warren Harrison because ThreeWP Broadcast keeps crashing our server before it completes the broadcasting to all sites on the network.
This is occurring on a WP3.3.2 multisite installation with about 50 sites.
When it crashes the server only some sites have received the Broadcast. Featured images do not stay attached even when the image broadcasts successfully.
If the Broadcast is retried, then duplicate posts are created on every site that did receive the first broadcast which is a mess to fix.
I have not tested broadcasting to only 3 or 4 sites.
It would be great if whatever is overloading the server could be throttled so the broadcast has time to complete without crashing the server.
I would donate toward this fix.