Why would a teacher want to use Twitter?
Because just a few minutes spent on Twitter can be very productive. Take this tweet from Craig Barton on an excellent resource – perfect for my Year 11 students revising for their GCSE module in the summer.

Being very selective in who you follow allows you to connect with teachers and other educators beyond your own institution.
Look at the resources I discovered through my early investigations of Twitter – a couple of great links from Maryna Badenhorst:
Maths posters to download and Brainbusters.
I was also interested to see from Teaching News that teachers on Twitter have shared teaching tips and ideas; see the #movemenon book, from Doug Belshaw (the pdf is free to download).
Some further examples: Mathscareers Website, Wolfram Fun Facts and Mathslinks.
For a quick way to find Mathematics related tweets do a search on any of these hashtags: #math #maths #mathchat.
You could even join a planned discussion – see the Mathchat wiki for details.
For learning to use Twitter see Russell Stannard’s training videos and some Twitter bookmarks.
So why do I use Twitter (and Diigo and belong to various teaching communities and..)?
For the reasons so well explained by Sacha Chua in her ‘Teacher’s Guide to Web 2.0 at School’.