Skier88 - 5:47 pm on Oct 22, 2011 (gmt 0)
You're looking for
word-break:break-all; - only problem is it doesn't work in Firefox or Opera.
However, I think that shortening the URL is a better solution than forcing it to wrap as you say. Remember that a URL is a single word - logically it makes sense to try to keep it on the same line. Failing to do that I would just leave it as-is and let the user decide whether they care how their post looks enough to use a url shortener.