infosume

to assume other people know something just because you know it or because you have seen a lot about it on the internet

"She infosumes people know things because there was a lot of discussion about it on twitter, even though most people don't use twitter."

"How do you not know that? It's all over the internet and gets brought up in this group regularly!"
"I am 13 years old and just joined this group an hour ago. Don't infosume."