I have recently launched a supplement store and was looking to drive more traffic from target audience. I do have a substantial twitter following of around 90k plus but most are not target audience, the odd tweet here and there does get a good response in terms of people being more nosey than anything..ie people that are not that in to their gym training but click the link for the sake of it. So I looked in to google ad words but the competition is way too competitive within my sector and quite honestly I cant afford to compete. So I was thinking about Yahoo equivalent. Is this worthwhile, and what are peoples experiences. I am assuming from doing a bit of research that it is not as competitive as google...probably for a reason.