You may already have a well developed website, maybe a blog too, a support Wiki adds to customer experience and RSS feed keep people informed you may also be well aware that the social media sites like Twitter and LinkedIn, for professional users and marketeers, are growing very fast.
There are some big names from the Audio Visual market already using Twitter - some are very prominent like Creston, Extron and Christie, there are also many Editors of AV and related press, magazines and journals on Twitter who belong to lists of AV "Tweeters". And there is also the opportunity to just see what others are doing as it happens.
If you would like to find out more yourself and would like to use Twitter please feel free to download this article that I plagiarised from books and various websites "How to Use Twitter for Business"