In September, spam on the LinkedIn groups that I subscribe to showed up at least once a day. I dropped some groups and sent a message to LinkedIn that they needed to help the group owners deal with spam. For whatever reason, spam in October on LinkedIn has dropped dramatically. I kept a log in October and I only saw five spam messages.
In November, I'm going to subscribe again to all the IBM i (also known as System i, iSeries and AS/400) groups that I can find and review them for this blog, including how much spam they have.