To get a better understanding of how Google+ is performing to date and who is using it, comScore pulled together some figures based on the first 21 days of its public existence (June 29, 2011 – July 19, 2011). Importantly, these data are based on unique visitors (which is different than “users” in that people who never sign up may visit Google+ pages) from home and work computers (which excludes usage via mobile devices). In addition, comScore is measuring behavior from people who visit plus.google.com pages, which may not include usage that occurs through the Google+ bar at the top of most Google pages.
20 million users in 21 days. Not a bad start. I’m on Google+ — just search for Jim Dalrymple and you’ll find me.