I updated to "consulting" when I RE'd in January.
Think I will give it a year and then re-evaluate/delete it.
I've read this thread with interest. I am on LinkedIn and do use it to advertise some of my speaking engagements and publish some of my blog posts. I am there for a different reason. I am still consulting and it is a cheap (free) way to advertise my consulting services, albeit it in an indirect way.
With regard to publishing, LinkedIn allows me control over my content. I found over the years that many times the periodicals that peer-reviewed my content then turned around and sold my information for their benefit. I figured if I was going to give it away free, at least I wasn't going to inadvertently line someone else's pocket with my 'donated' efforts.
Nevertheless, I do find LinkedIn is quite the spammer. However, I have their emails auto-junked, so I don't know what is going on unless I peruse the junk folder or log in to LinkedIn.
I have been able to keep in touch with some colleagues and friends through LinkedIn messaging, but usually the conversations move over to email from that messaging.
When I retire-retire (who knows? I do like what I do in consulting and doing it 10-20% timewise would keep my mind occupied on something that interests me), I will probably retreat even more and possible delete LinkedIn.
Now, Facebook is another story - have an account - have not logged in in 5 years - will not log in and will probably delete it. Just too lazy to go through the bureaucratic rigmarole with them.