Reference back to CPD23 Things 2012 post: http://cpd23.blogspot.co.uk/2012/06/thing-6-online-networks.html
I use Facebook for personal stuff and to network with colleagues-who-are-also-friends.
I use LinkedIn for... not entirely sure yet. I have at least 10 contacts, and I've updated my career on my profile, but I'm not sure what I can use it for usefully. If I want to look at careers abroad, I'll use it to network with Australian librarians (in Melbourne, please), and see what I can find...
I subscribe to about ten different Jiscmail listings, to keep in touch with the LIS worlds that I inhabit.
Maybe I should do more online networking, but I find that there's a fine line between online vs real world, working on my day-job work, and networking for work purposes vs networking for the sake of networking.
I will investigate the CILIP communities and see what I can learn from them about the worlds that other LIS professionals, in very different sectors to mine, inhabit and how those worlds differ from the health/NHS/HE sectors.