Does anyone know if there is a way to have a dashboard refresh daily and automatically post to Chatter? It would be like scheduling a dashboard, but instead of emailing it to anyone, it would post to a Chatter feed...
Have you had a look at dashboard chatter feeds?
I haven't tried it but looks like combination of scheduled dashboard refreshes (meaning you'd still might have to "spam" one user?) and this could do the trick.
Setup -> Customize -> Chatter -> Feed Tracking -> Dashboard (if you don't have it ticked already).
So I guess you wouldn't see the changes for whole dashboard, just metric/gauge pieces (probably so the Chatter post is not an one giant image).