Facebook, Twitter and Google+
Facebook is probably where I'm most active online these days.
I'm also on twitter as @lnr_blair, though I rarely log in.
I'm no longer a member of Google+
Blip, Flickr, Instagram
Most days I try to post a picture relating to Matthew and me on blipfoto.
I also post more sporadically to Instagram and can also be found on Flickr
Livejournal and Dreamwidth
Due to their restrictive new terms and conditions I no longer update my Livejournal, although I still read those of other people, and all my old entries currently remain.
I can now be found on Dreamwidth instead, and still post occasionally.
Alltrails, Strava, Fitbit
I occasionally log my cycling and walking trips as tracks on Strava or blog entries on AllTrails (formerly EveryTrail).
I can also be found on FitBit.