So I came up with an idea that would significantly increase the numbers of people we could bring to the site but I wanted to run it by members first in case anyone had concerns about it.
The idea is to put facebook, twitter and google plus social 'share' buttons on ALL threads. This would function like (though maybe look different to) the 'share' button at the top of this story http://www.aljazeera.com/news/middleeast/2012/11/201211255459324484.html. Someone just needs to click the share button and can post the thing to their wall or group or page etc in another click.
By doing this we enable people to share threads with just two clicks whereas currently they have to cut and past the url.
I realise that some people may have privacy concerns about this in particular regarding training logs. Allow me to try and respond to these in advance.
a) regarding privacy I hope everyone already realises that all posts here (except the members photo and video section for which you have to log in) are visible to the rest of the internet who can not only see but share. Admittedly, the sharing button makes them MORE visible and easier to share but still I would always recommend that (even in the absence of a share button) people assume that the whole word can see what they write here. Yes we are posting under pseudonyms but again I would always recommend assuming that people have found out what your handle is. I'm a bit of a paranoid android on this stuff but still.
b) we could (I think) build in an exception for training logs so that these don't have the share button
Anyway let's hear what people think
edited in light of Fredickw's comment below

