Can Tags and Posts be used across multi networks?

Have Post Indexer *BRILLIANT PLUGIN* and Global Tags etc running beautifully on a BP install and WP Multisite....

Lets call that Network A. I have set up Network B, on same WP/BP installs using Domain Mapping, Network+ plugin and BP Multi Network plugin from buddydev.... All works well.

Is there anyway, I can "syndicate up" tags and global posts via Post Indexer or Global Tags to pick up Tags and Posts from across both Network A and B?