I have had a Linked In profile for a while now. The recommended reading by Sharlyn Lauby was very good. I went back and reviewed my profile. It is basically pretty good: professional photo, fairly explicit introduction to my work experience and interests, I have 3 referee statements and around 100 connections, none of whom I am embarrassed of :) I have never bothered with groups before but after looking at the examples I see they do add weight to a profile. Reminds me of Mum saying: "you are judged by who you associate with". I have my Slideshare account linked to my Linkedin which means that several of my slides from presentations can be viewed. I am careful what presentations I have saved online as I am aware they show on both sites. I never update my profile which I will have to address. I don't feed my Twitter comments here because I am pretty lighthearted and irreverent on Twitter sometimes ... and I like that tweets can't be found after 3 weeks or so - not so with LinkedIn.
I have had a facebook account in the past; I was a reasonably early adopter well ahead of my kids who were still using bebo. However I cancelled it about a year ago for a number of reasons:
- I got sick to death of the way facebook kept changing their approach to privacy,
- I used facebook for my family only - and I explicitly stated that on my profile but still received dozens of requests from colleagues and vague associates wanting to be my friend (I hated saying no),
- I allowed myself to get bullied into friending my kids and their mates and accepting their invitations to Mafia Wars, Farmtown etc and then ...
- I got hooked into stupid online games (farming)
- sick of stupid updates from friends about game, quizzes etc.
I don't regret closing facebook at all except for relinquishing my account means I can never get jransom back again if I ever regret not having an account.