Following a six-month upward trend for Yahoo’s US search market share, Bartz’s baby hit a brick wall in February according to comScore, sliding slightly from 21 percent in January to 20.6 percent. It’s a very small decline of course, but you can be sure Yahooligans would have liked to see a continued upward trend as Microsoft shows a renewed interest in search talks. At the same time, Yahoo’s share still sits above the crucial 20 percent mark which is no small feat considering the dominant opposition. Slight slip aside, Yahoo is unquestionably making good progress as comScore reports an astounding 12 percent year to year growth in Q4. Other notables from the February US report: MSN dropped to 8.2 percent from 8.5 percent in January, Ask rose to 4.1 percent from 3.7 percent in January, AOL stayed flat at 3.9 percent and Google snuck up to 63.3 percent from 63 percent in January.