Parse facebook namelist into usable lists for username bruteforcing

gistfile1.txt

#First.Last
$Unamestream = new-object System.IO.StreamWriter("names.txt")
$FNames = Get-Content fname_10.txt
$LNames = Get-Content lname_10.txt
foreach ($FName in $FNames)
{
	foreach ($LName in $LNames)
	{
		 $Name = "$FName" + "." + "$LName"
		 $Unamestream.WriteLine($Name)
	}
}
$Unamestream.Close()
#FirstInitial_Lastname
$unameStream = new-object System.IO.StreamWriter("unames.txt")
[array]$letters = "a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z"
$lastnames = get-content lastnames.txt
foreach ($letter in $letters)
{
	foreach ($lastname in $lastnames)
	{
		$uname = "$letter + $lastnames"
		$unameStream.WriteLine($uname)
	}
}
$unameStream.close()