Create TinyURL within PowerShell

Get-TinyURL

clear
Function Get-TinyURL { 
    #PowerShell - Get-TinyURL API Call
    param (
        [Parameter(Mandatory=$true,ValueFromPipeline=$true)] 
        [String]
        $sHTTPLink
    )

    if ($sHTTPLink.StartsWith("http://") -eq $true -or $sHTTPLink.StartsWith("https://") -eq $true)
        {
            if ($WebClient -eq $null) {$Global:WebClient=new-object System.Net.WebClient }
            $webClient.DownloadString("http://tinyurl.com/api-create.php?url="  + [System.Web.HttpUtility]::UrlEncode($sHTTPLink))
        }
    else
        {
            Write-Output "Bad Link, please include http:// or https://"
        }
}

Get-TinyURL "http://google.com"