When Google+ first launched, the new media was quick to call Google’s new social network a Facebook Killer. After about a week into the service, a few data points and a shift in discourse is showing that’s not likely to happen. Instead, Twitter better watch its back. Larry Page announced yesterday that Google+ now has over 10 million users, sharing over 1 billion items per day. Twitter, on the other hand, has 175 million accounts, but there are just 56 million accounts on Twitter following 8 or more accounts. Breaking it down further, there are only 1.5 million accounts on Twitter following 512 or more accounts. That’s only 1.5 million accounts on Twitter that are considerably engaged and active on Twitter, compared to the 10 million on Google+ — after just a few weeks.

If those numbers don’t already indicate Twitter’s doom in the shadow of Google+, many content creators are already seeing a steep shift in traffic referrals, away from the little bit that came via Twitter and now coming from Google+. We are seeing it here at LockerGnome, and MG Siegler has noted a huge increase in traffic from Google+ at TechCrunch. Jason Calacanis also has shown the drastic impact Google+ has had on referrals to the LAUNCH blog, driving a little over twice the traffic as Twitter. Is this because content on Twitter disappears too fast to catch it, a problem which G+ solves by pushing popular content to the top of streams?

Or is it because people are abandoning Twitter? Many users of G+ are admittedly using Twitter less. I asked users of G+ whether they are using Facebook and/or Twitter less in favor of Google+, and over 60 people echoed similar sentiments that they were, in fact, using these social networks less. Specifically, many were using Twitter less for reasons including that it was too difficult to read, or because they are both similar. This highlights that Twitter users are largely still an “early adopter” crowd — which is what comprises most of Google+. As some pointed out, managing multiple social networks on a personal level can be difficult. So are these Twitter users, who comprise the majority of activity on Twitter, leaving the conversation on Twitter behind, switching to Google+ instead?

And if so — what will happen to Twitter? Is a successful Google+ indicative of a doomed Twitter? Let us know what you think in the comments.