If you tweet you know what twitter is.
Your postings on this site can be autotweeted onto twitter. To enable this click on "My Account" and then "Edit". In that screen you'll find settings for your twitter account.
Once entered anything you do on this site will become tweets.
Was the auto-tweet option removed? The settings do not appear in the Edit tab of the profile now, but I know I added it a week or two ago. I do see the link after Ignore user and Quote. Is this the only option now?
I may not have re-enabled everything after the upgrade.
The twitter-style-T icon below posts as well as the 'share' button help you do manual tweets.
There is a twitter tab in the My Account page, and maybe that's it.. hang on, I'll check, don't go away.