Lesson 1 from the Yahoo report -- don't buy or sell stock based solely on comScore numbers. Ha!Lesson 2? That's a bit more complicated. Everyone looking for clues into the next act of the Yahoo-Microsoft takeover saga can find plenty of weak numbers to chew on in Yahoo's first-quarter earnings report.The weakness in search ads for the financial, travel and retail sectors suggest that the Internet's biggest display ad seller (at least for now) may have trouble hitting its forecast if the U.S. economy continues to weaken.The relative weakness of ad sales from its partner sites, compared to its own Yahoo sites, continues a trend we've reported on for some time -- that smaller, vertically-focused ad networks are taking an ... [ Read more ]