And maybe a different type or just a version of 1b
When I was doing our service IT support I used to have a user who came to my desk at least a couple of times a month in a panic to "warn" me about some supposed virus she'd read about on Twitface or somewhere. If we even saw it, it would wipe all our hardrives, set our desks on fire and bring about the end of civilisation as we know it.
And when I didn't run round the room shouting "Don't Panic" while dialling 999 and possibly carrying in a fire extinguisher she'd go off in a strop and sulk for the rest of the day.
Worse ( or not?) if I wasn't there she'd be running around "warning" all the other staff or getting someone to phone Corporate IT and demand instant action to protect us from this scourge.
I kept Snopes and Hoax slayer icons on my desktop.....