Posted on April 3, 2012 by TerrenComScore: Android's US market share passes 50 percent, BlackBerry OS and WP7 slide ComScore: Android's US market share passes 50 percent, BlackBerry OS and WP7 slide Another month, another round of ComScore's US mobile studies. For the three-month average period ending in February 2012, 234 million Americans age 1 This was posted on Google+…