So: please leave a note on this post (anonymously if you wish) saying whether I a) know you in person, b) consider yourselves my friend, acquaintance, colleague, stalker or other and c) whether you think there's any difference between being an online 'friend' and an offline/real-life friend. Just out of interest.
I realised during this lecture too how many SNSs of which I'm a member. While rejecting Facebook, I'm on three fencing forums including the main British Fencing one, Librarything, Flickr, Academia.edu and several others.