We've heard this one before: a seemingly well intentioned corporation makes promises to uphold user anonymity, but when market pressure proves too much to handle, it's left to weigh the benefits of privacy over profit. Well, it looks like Yahoo's not immune to such goings on, as it's just announced that it will renege on its previous data retention promises and hold on to raw search data for 18 months. That's a pretty significant change, as the previous policy boasted data retention limits of only 90 days. If you ask Yahoo, though, it's just g
