Most Sector Leaders remain well extended beyond their buy points. But Facebook and Alexion Pharmaceuticals are near striking distance. Facebook (FB) is completing the sixth week of a flat base and has been flirting with a buy point of 76.09 this week. The stock closed above the entry on Tuesday but fell back below it the next session. On Thursday, it climbed 0.12 to 75.95, still below the buy point. Volume hasn’t yet come into play.