"A tweet sent by the force's Greater Glasgow division on Friday warned: `Think before you post or you may receive a visit from us this weekend`."
"It also urged social media users to consider whether a post was "true, hurtful, illegal, necessary or kind" before they sent it...."
"In a blog post on the Spectator website, the magazine's Scotland editor Alex Massie, asked: `Whatever next? The monitoring of conversations in public houses? Why not? Twitter and Facebook, after all, are merely digital, virtual, gathering places.` "
"And he said the police tweet raised important questions about the value placed on freedom of speech in Britain. "
"But some Twitter users were supportive of the police, and said the force was only warning about `illegal` activity online."