I’m not a social network expert by any measure, but it seems to become clear that although the initial enthusiasm among the geek-crowd was big, Google Plus isn’t cutting it in the real world. I don’t have a Plus-tab open in my browser any more and when I do go Plus, there isn’t a lot going on in my circles which I want to participate in.
Compare that to the way Yammer took off at the company I work for; in less than a months time 800+ colleagues (out of approx. 1500 employees) joined and we’re getting to know new colleagues, discussing more or less work-related topics (1500+ messages) in the open or in multiple interest-specific groups (15 at this moment). Good times!
I don’t know how Yammer is doing in other companies in Belgium (and Europe by extension), but to me is seems that Yammer succeeds where Google Plus is failing; bringing together a group of people (in a more or less “private” environment) that share a common context but who didn’t share a social network before and allowing them to engage and to create engagement.
Google Plus might be neat from a technology & privacy point of view, but it essentially was (and still is, I guess) a “me too” exercise, trying to occupy a market that has already very successfully been taken by Facebook & Twitter. And yes, Yammer does have an API.