At The Register, OUT-LAW.COM outlines the things to avoid saying on Twitter:
Debates in Parliament, home visits from the police and distressed celebrities have all left tweeters a little unsure as to what is and what is not acceptable by law on Twitter.
The list of those offending and those offended keeps growing with recent high profile reports referring to Louise Mensch, Tom Daley, Guy Adams, Steve Dorkland, Helen Skelton and Kevin Pietersen. This guide discusses 10 legal risks which apply, or potentially apply, to Twitter, in the context of recent media attention given to the lawfulness of tweets.
This is not just of intellectual interest to those of us living outside England: American, Canadian, Australian, Dutch, Indian, or Zimbabwean Twitter users can be sued in English courts (your country may or may not have laws shielding you from this kind of legal action, but most currently do not: the law lags well behind the technology).