Right. "135 million active users checking their Google+ streams each month".

And what, we guess that Google is using the Facebook definition? https://www.facebook.com/help/219375581424410/

Which means... unique user page views with 0 engagement metrics! Yay~

MAU and DAU are meaningless statistics. It's pure eye-views, that's all.

Show me some average aggregate visits per user per month, and I'll believe there's actually something happening (ie. the average number of times each unique user visited the site in a single month. Hint: for Facebook, this number is probably ~20-30).