From Search Engine Land, v. interesting graph on rise of Google+ http://searchengineland.com/behind-the-numbers-of-googles-monumental-rise-to-25-million-unique-visitor-88076

From Search Engine Land, v. interesting graph on rise of Google+

http://searchengineland.com/behind-the-numbers-of-googles-monumental-rise-to-25-million-unique-visitor-88076