apparently if you get links long enough a space appears
http://boards.straightdope.com/sdmb/newthread.php?action=newthread&forumid=2http://boards.straightdope.com/sdmb/newthread.php?action=newthread&forumid=2 right in straightdope a space appears
If you type enough text without a space, vB inserts a space into it so the line can wrap. Unfortunately, this also happens if the text is in a URL tag and not being displayed. One complaint I have about vBulletin is that they seem to have not put much thought into the order in which things are done. For example, smilies are inserted after ampersands and angle brackets are replaced with html escape sequences, leading to the <) >) >j <j &) and &j smilies.