aristotle - 5:44 pm on Oct 15, 2012 (gmt 0)
Having never installed Google+ on my mobile, it sits in my "Updates" list trying to trick me into "updating" (actually "installing for the first time") something that I don't want. There's no way to remove it from the "updates" list, other than "updating" (installing) it.
When they ask you to agree to their terms of service, click "I decline" instead. That ought to put an end to the problem.