'Twitter is the last of the Big Four to go public.'

Twitter is meant to be the epitome of freedom of speech, but starting messages with certain words will ban your tweet – purely because of quirks in the system which remain from the early days of the network.

Start a two-word message with the word “Get”, and your message will never to be seen again.

Why? Because the word acts almost like the old “shell commands” from the pre-Windows days of DOS – where programmers would type commands like “copy” and “delete” to do those actions nowadays generally covered by right-clicking on files.

On Twitter, if you type “Get” followed by a username, you will instead get the latest Tweet from that user.

You can also try things like “set language german” to affect a language change, or “set bio I am a Twitter user” to update your one-line biography.

“Help” could be a useful command, as could “suggest”, if you want to find more people to follow.

But the “Get” command is likely to stump a few users, as simple messages like “Get Well”, “Get a life”, or “Get me some milk please” will vanish, without warning.

According to BuzzFeed, the reason these commands exist is because they are useful for people who Tweet via SMS: In the same way computer users needed to write commands into DOS, SMS users needed these codes to use the site. – Daily Mail