Tips on using Twitter - free downloadable guidebook

I'd like to think I know a thing or two about social media and Twitter but I needn't spend too much time writing up a guide when all you need to know has been done over at Mashable.

Whether you are a beginner or a regular Twitter user, Pete Cashmore has written one of the most extensive Twitter guidebooks on the subject you'll ever likely to need.

There's even a downloadable version so you can sit away from your work and read through.