The Link Format for adding Twitter to your Social Bookmarks functionality is:
To add the functionality to your Social Bookmarks List:
1. From the Control Panel under 'Social Networking' choose 'Add/Edit Social Bookmarks'
2. Under 'Add New Bookmark' enter 'Twitter' under 'Social Bookmark' --> enter http://twitter.com/intent/tweet?url=|url|&text=|title|' under 'Link Format --> and check the box for 'Active'
3. A copy of the image for the Twitter Bird Logo can be found here:
Go to that webpage, and right click on the image to save it to your computer.
Under the 'Image' column in Social Bookmarking click on Browse and choose the file from your computer to upload.
4. Click on the 'Add/Edit Social Bookmarking Links' button