Also, even if StumbleUpon provides targeted advertising, it's still quite likely to be very poor-performing traffic. If you're exposing people to things they were unaware of before, then, by definition, they're going to be very early in the sales process, and the conversion rate will be abysmal.
Because of StumbleUpon's very low costs ($.05 per unique visitor) for targeted traffic, their ads, which aren't even marked as such, can be a really good deal depending on what your site or product is.
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Also, even if StumbleUpon provides targeted advertising, it's still quite likely to be very poor-performing traffic. If you're exposing people to things they were unaware of before, then, by definition, they're going to be very early in the sales process, and the conversion rate will be abysmal.
Because of StumbleUpon's very low costs ($.05 per unique visitor) for targeted traffic, their ads, which aren't even marked as such, can be a really good deal depending on what your site or product is.