Twitter prevents people using a particular password indicating that certain passwords such as ‘password’ and ‘123456? are too obvious to be picked.It just so happens that Twitter has hard-coded all banned passwords on the sign-up page. All you need to do to retrieve the full list of unwelcome passwords is take a look at the source code of that page.A few more from the list are coffee,chicken,cowboy,doctor,flower,guitar.ladies.killer,naughty,oliver,prince,silver etc. For full list check here TXT file. There are 370 Banned Passwords by Twitter. There was the full list on TechCrunch, that has record of all such passwords which are pretty obvious and are banned by twitter.These may be probably representative of common passwords of most Web services.