There’s no doubting it. You can barely turn on the TV, look in a newspaper or log onto the internet these days without seeing something about Twitter.As you probably know, Twitter is a social networking website where users post “tweets” (essentially a short message or ‘status update’) about what they are doing at a particular point in time.A “tweet” can only be up to 140 characters in length, so the messages are very short – ie. It is micro-blogging, rather than full length blog posts.A tweet can be a short message or a message to another user, and it can include words, numbers and even hyperlinks.Twitter is used by all kinds of people – from private individuals who use it to keep track of their interests and follow people they know, through to celebrities who use it promote themselves and communicate with fans, and businesses of all sizes - from small local firms through to global multinational organizations.