[seabird]

You honestly did nothing wrong. I don't think Facebook is looking for UNIX admins/developers, nor are they going to find any for an internship. CS students with experience in AIX, HP-UX, Solaris, or FreeBSD are exceedingly rare. Solaris and FreeBSD are the only two systems that Facebook would have a chance in hell at finding interns for, and even that's a stretch. AIX and HP-UX are expensive and the licensing is painful.

Getting a little frustrated with resume-screening-by-grep is not at all unreasonable. After the recruit had you play whack-a-mole for three resume revisions, a little bit of snark is to be expected. Don't let people walk over you.