Don't Tweet Your Password. Duh.

Twitter users report seeing tweets claiming if a user types his or her password into the live feed, twitter will automatically obfuscate it. These posters claim to have entered in their passwords to demonstrate, and allegedly all asterisks appeared when the tweet went live. If you've seen this tweet please ignore it, it's not true. The tweet is just a ploy/gimmick/joke to get people to post their passwords. Here's an example of this kind of nonsense.

On the other hand, though, twitter does have a list of "bad passwords" that the service will not allow you to use when setting up an account. Here's the list of banned passwords. Remember, just because it's on the Internet doesn't mean it's true.