Mac said
9 months, 2 weeks ago: @amyhallbiz (from the article) Google first indicated last year that it planned to release an enterprise version of Google+. … Google+ was launched as a consumer social networking site in mid-2011, but [now]Google is joining the hot ESN trend [with] employee profiles…streams, microblogging, document sharing…blogging, discussion groups and…communities.
Interesting read.