Desk.com was surprisingly slick

The product was good but narrowly focused on customer service, as you'd expect of course but in the grand scheme of enterprise social service, one needs a more "panoramic" approach to social. Additionally, the account managers at the time were not very engaged, did not follow up appropriately, and basically let the grapes die on the vine with this POC. I think they just lost interest. This was shortly after the Salesforce acquisition so maybe that's the reason.

Sure I'd recommend at least giving it a whirl as they probably evolved the platform by now - although I would make it clear that the features are very limited to customer service usage. For a small/medium size company it might be an interesting investment.