Such an experiment is somewhat ad hoc but should at least provide a proof-of-principle, according to Jim Tartaglia , global head of HIV research at Aventis.

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The responsibility push came at the same time that Liberty decided to boost its somewhat skimpy ad budget.

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The tech press was somewhat dubious about these ad products when they launched for a few reasons, starting with the fleeting attention they would get from Twitter uses, who tend to check in and out of the site fairly quickly, to fears that they would be too intrusive.

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