No, I just list them and I do not send any follow-up message. Many do find out immediately though, because others tell them about it. I seem to get a lot of referral traffic from LinkedIn after doing updates, so I guess someone is posting about it over there.

I had someone well known in the local tech community call it "The most unprofessional thing I have ever seen" but later he was using it as a sales tool to persuade one of the companies listed to hire him to upgrade their site. I don't condone this but once the info is public I can't control what people do with it.