This is a very lightweight free Twitter widget by Radiated Pixel.
Twitter declines the request for tweets without authentication, so it's only possible to view a random amount of tweets. However, the latest tweet should always be shown.
To get a specific amount of tweets, you have to activate all include-parameters inside the json-request (which is now done by the plugin). So if you want 5 tweets, you'll get them!
You have to edit the plugin on lines 156 and 157.
Just wait for the page to make the next query to tTwitter. Alternatively you could set the "Update tweets every [x] seconds" to 0