Currently the Google Plus URL detection for social networks is 'plus.google.com', but the referrer is actually 'plus.url.google.com'. I would like to have this updated to include plus.url.google.com to reflect Google's social network contribution accurately. Please vote this up!
I validated this with Omniture DW by building a page view container where
Referrer type = social network
Referrer contains 'google.com'
I only got a few google reader results, but no google plus results (plus.google.com or plus.url.google.com).