I receive quite a few notifications of funding opportunities by e mail, newsletters etc and am always happy to share them, either directly to organisations I think they're suitable for, or via social media.
I've noticed that there doesn't seem to be a consistent hashtag for sharing this type of information on twitter.  It seems like it could be a simple way of allowing fund seekers to identify these opportunities and improve the information flow (alongside developing other tools).  I'd be interested to know if others think about whether this could be useful and/ or whether I've missed the secret funding #!