One of those totally brilliant and obvious-in-hindsight ideas. I'd like to see stronger guidelines on citing sources as it grows and clear differentiation by region/nation, because it's easy for vague figures and rumour to become universal 'fact', but it's a great idea and will hopefully grow: Social Media Statistics is:
A big home for all facts and figures around social media – because I'm fed up of trawling around for them and I'm also sure that I'm not the only one who gets asked 'how many users does Facebook have?' every hour of every day. … I'm hoping that this wiki will not only include usage stats, but also behaviour and attitude stats. It's a bit of a skeleton at the moment, with v few of my stats having stated sources, but be patient – and help where you can!
Please add in any juicy stats as you come across them, and do cite your references and link to them where possible.
I'll put my money where my mouth is and add information I find. I find wikis a really useful tool for lightweight documentation – it's really easy to add some information while it's in your brain, and the software doesn't get in the way of your flow.
For a while now I've wanted a repository of museum and cultural heritage audience evaluation – this could be a good model. Speaking of which, I really must write up my notes from the MCG Autumn meeting.
[Edit to add: Social Media Statistics also links to Measurementcamp, which might be of interest to cultural heritage organisations wondering how they can 'measure their social media communications online and offline' (and how they can work with project sponsors and funders to define suitable metrics for an APId, social media world).]