Whew — I thought I got a virus — I was going through /var/log and saw popularity-contest — and I said, wtf?
DEBIAN PACKAGE POPULARITY CONTEST – Avery Pennarun <email@example.com>
This package contains a script, /usr/sbin/popularity-contest, which
generates a list of the packages installed on your system, in order of
most-recently-used to least-recently-used. The simplest way to use this
information is to help clean up your hard drive by removing unused packages.