[Hall of Famer]

Its in the script /view/profileview.php, in this line:

PHP Code:

$tabs = new Tab(5, $tabsList, 2); 


Here the third parameter(2) defines the default tab opened when you enter a user's profile page, the value 1-5 corresponds to (Visitor Message, About Me, Adoptables, Friends, Contact Info). So you can see why the default is About Me.