Someone that doesn't have a Google+ Account, or perhaps any other social network account. A person who may have no knowledge of social networks.
You missed the party? I had no idea you were Nonplussed.
Often misused as meaning unfazed, but actually means bewildered.
English majors are nonplussed about how "nonplussed" has, over time, become so misused.
(Verb) Unable to act, speak, or think; bewilderd
After reading many letters and statements, Gean was nonplussed by it all and had to take a breath.
The news of a new reorganization got him nonplussed.
When your bank card won't work at another bank's ATM because your bank is on the Plus System debit network, but the ATM is not.
Many "foreign ATMs" are on the Interlink or Star networks -- they are nonplussed.
When someone is lickin' on a D
I'm completely nonplussed.