a person who doesnt have much social life otherwise, but has lots of friends on his online messengers whom he/she tries to make contact with desperately when online.
from a chat window...
Dave1 : Dude... last night when i was tipsy i realised how cyber social i am in this foreign country
Dave2 : yea dude... this chick told me that u were sending nudges to her like crasy last night !
Cyber Social Anxiety is a condition that someone has when they have a fear of socialising with others online possibly due to past experiences getting cyber bullied, doxxed, or even no reason at all.
Typically, those people may have little to no online presence, including no social media and may request not to have their pictures taken in case it shows up online where they would get made fun of.