[napoleond]

I went to G+ last week because Google requires it for the "Author" feature in search engine results (pure vanity, my blog posts will never show up in SERP). I went to G+ for thirty seconds this week to read the post about the guy who "cracked" a really lame DRM scheme. I don't consider myself an active G+ user at all, and yet I'm sure those "actions" (adding a URL to my profile and viewing a post) contributed to the 135 million, and I'm willing to bet I'm not the only one. Engagement across G+ per unique monthly visitor is almost certainly an order of magnitude smaller (by time on site, for example) than Facebook's.