Twitter

Signed up for Twitter yesterday, as people say it is worthwhile.
Maybe.
My handle there is philwrite
Spent some time chatting etc, finding how to Twit and so on. Then got ambitous and put a link to In the Valley along with a free ebook coupon code on several threads.
Went to Smashwords today to check the results.
Zero 'sales'(which includes free downloads) and as far as I can see, also zero samples downloaded.
However the stats show 150+ page looks, which is way up from about 4 or 5 daily.
So probably that means whoever was looking is the wrong demographic. Just not the market to aim for. What is though?
Will have to try and direct efforts at the likeliest readers - lit fic readers most likely.