The title of Clay Shirky's great book about the nets, Here Comes Everybody: The Power of Organizing Without Organizations, comes from James Joyce's Finnegan's Wake, which has lots of HCE's in it, including the initials of the protagonist, Humphrey C. Earwicker.
Not that I've read FW.
But I rummaged around online and found one of the references:
"...it was equally certainly a pleasant turn of the populace which gave him
as sense of those normative letters the nickname
Here Comes Everybody. An imposing everybody he always indeed looked,
constantly the same as and equal to himself
and magnificently well worthy
of any and all such universalisation, every time he continually surveyed,
amid vociferatings from in front of "Accept these few nutties!"
from good start to happy finish
the truly catholic assemblage gathered together in that king's treat house of satin
alustrelike above floats and footlights..."
--James Joyce, Finnegan's Wake, New York: Viking Press, 1939, p. 32.
I really like those last three lines!
Quote found in comment thread about whether or not Joyce was referring to the Catholic Church--seems he meant "catholic" with a small-c (meaning "universal"), here .
Video of Shirky talking about his book.