We wanted to get the messages posted on the forum to be viewable by twitter. So we installed a Twitter mod. This automatically published topic names of the forum onto Twitter. The published posts can be customized via template. The long URLs get automatically replaced with the short, easy-to-read ones. There is an option for each board to enable or disable topic publication on Twitter. This mod is a wonderful way to bring more targeted traffic to out site without buying any ads.
Below is the screenshot of the setting we installed on the twitter mod and how its post linked to twitter: