$username = "xxxxxx";
$password = "xxxxxx";
$url = "www.facebook.com/login";

$ie = New-Object -com internetexplorer.application;
$ie.visible = $true;
$ie.navigate($url);

($ie.document.getElementsByName("email") |select -first 1).value = $username;

Exception from HRESULT: 0x800A01B6
At line:1 char:1
+ ($ie.document.getElementsByName("email") |select -first 1).value = $u ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo          : OperationStopped: (:) [], NotSupportedException
+ FullyQualifiedErrorId : System.NotSupportedException