You no longer get to drink from the firehose. Morons have no longer invaded your screen saver.
Some time recently Twitter turned off the feeds of public twits. Turned them off entirely instead of just rate-limiting them or something. There's a new API to provide a "small random sample of public twits" but it requires authorization via an API key.
Suggestions for a public replacement URL to make be the default text-source in future releases of xscreensaver?