The news started spreading a couple of days before but at that time checking my Google Account I could only find a landing page explaining some of the platform features and I signed up my email to get an update as soon as it was launched.
Today after arriving at the agency @numian seemed to gain access to Google Plus using his Android mobile. And after playing a bit more he also found that he could just share something with other Google users (Google Accounts for that matter) and they would receive an email with a link to the shared item on Google Plus. As soon as you were able to see the shared item you were already inside Google Plus and this was the way to share Google Plus “invitations” with a couple of friends.
Later today Google seemed to notice the stronger than anticipated increase in “beta users” and closed this workaround. I am pretty sure they knew about it all the time, but they were just waiting until they got an interesting number of people inside the platform, without giving out invitations to everyone, but because they just know that would create an added buzz.
Having a look at my Twitter and Facebook feeds I would say they just nailed it, because they are everywhere and everyone is still trying to get a sneak peek at the thing.
As to the discussions of whether or not it will take over Facebook I will leave that to another day. One should bear in mind that Facebook is huge but so is Google and the interface (UX/UI) of both platforms seems like going from Windows (FB) to Apple (Google+) so we should not underestimate neither company since they are both 800-pound gorillas.