People who refuse to create their own profile on various social media platforms such as, facebook, twitter, etc.
A: 'How come you didn't invite Seb for your party tomorrow?'
B: 'I did invite him'
A: 'He's not attending your event on facebook though..'
B: 'Yeah, he doesn't have a profile'
A: 'Ugh, he's such an anti-socialmedialite'