Assuming I eventually manage to make it do stuff, please let me know if you're on the site and under what username so I can friend you.
Edit 3 pm: I managed to get the friending thing to work by means of using IE instead of Firefox. But still no luck with the IM system
Edit 5 pm: It's not me, it's Twitter; you have to try things a dozen times before it actually does anything. Thanks to pplfichi for testing for me