LONDON — The British government told civil servants to go forth and tweet.

The government published guidelines today for its departments on using the microblogging service Twitter.

Yet in contrast to Twitter's limit of 140 characters per message, the document runs 20 pages, or more than 5,000 words.

Neil Williams of the Department for Business, Innovation and Skills, who produced the guidelines, acknowledged 20 pages was "a bit over the top," but said he had been surprised by "just how much there is to say."

The document tells civil servants their tweets should be "human and credible" and written in "informal spoken English."

It advises government departments to produce between two and 10 tweets a day, with a gap of at least 30 minutes between each "to avoid flooding our followers' Twitter streams."

The advice said Twitter can be used for everything from announcements to insights from ministers, and in a crisis could be a "primary channel" for communicating with the electorate.

The document warns against using Twitter simply to convey campaign messages, but notes "while tweets may occasionally be 'fun,"' they should be in line with government objectives.