I played with this ~3 months ago after discovering it in a comment thread on Ryan Carson's blog.
It's well designed but I didn't see a use for it myself. Inc (https://sendtoinc.com/) is also very similar (@nchirls submitted it on linkydink a while ago).
We use this. I wouldn't call it much of a comparison to Yammer (although maybe it will grow up to be). It is basically just a link sharing service (that can be private or public). Pretty comparable to Inc (which I've also used).
I got sick of article sharing via email or hipchat and wanted a dedicated place to keep things. Honey ended up being the best solution I could find. I'd recommend it as a private link sharing service, but frankly not much more than that.
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