None of my friends are going.

"None of my friends are going" is a very common mistake in spoken American English; you almost never hear it said correctly anymore.

The correct sentence should be, "None of my friends IS going," because 'none' is the subject and 'of my friends' is a prepositional phrase and therefore not the subject. But Americans usually match the verb to whatever's closest to it, subject or not.

Example:
-Are you going to the dance Friday night?
-I don't think so, Mom. None of my friends are going.