I don't know how much interaction with twitters api you are planning. If you simply want access to your feed...
You might be able to use something like yahoo pipes to transfer the data to a rss feed, and pick it up in Isadora via the tcp-ip actors (like in my tutorial).
If you want to have full api access/control you will need code that can manage the Oauth login requirements (flash can, as well as, PHP, Python etc..)
On the forum another member is using node.js to connect to twitter, and is sharing the data via OSC, so that no TCP actors are needed.
Unfortunately it is the security requirements of twitter/facebook etc.. that make this currently to be a more difficult task.
If you are on a MAC, I would bet that there is a Quartz Composer patch that will connect to twitter that you could integrate.
Or similar could be done with Processing.
OSC might be easiest, so I would search for any tools that will output twitter data as OSC.
I hope thats a help? I know its many options...