Disable-AudienceTargetingOnList.ps1

<#
.SYNOPSIS
    Disables audience targeting on a SharePoint list or library.
	
.DESCRIPTION
    Disables audience targeting on a SharePoint list or library.
    This will delete the audience targeting column from the list. All information contained in that column, will be lost!
	
.NOTES
    File Name: Disable-AudienceTargetingOnList.ps1
    Author   : Bart Kuppens
    Version  : 1.0
	
.PARAMETER Web
    Specifies the URL for the web where the library is located.
	
.PARAMETER ListName
    Specifies the name of the list where you want to disable audience targeting.
	
.EXAMPLE
    PS > .\Disable-AudienceTargeting.ps1 -Web http://teamsites.westeros.local -ListName Documents

    Description
    -----------
    Disables audience targeting on the "Documents" library on http://teamsites.westeros.local
#>
[CmdletBinding()]
param(
    [parameter(Position=0,Mandatory=$true,ValueFromPipeline=$false,HelpMessage="Specifies the URL for the web where the library is located.")]
    [string]$Web,
    [parameter(Position=1,Mandatory=$true,ValueFromPipeline=$false,HelpMessage="Specifies the name of the list where you want to enable audience targeting.")]
    [string]$ListName
)

# Load the SharePoint PowerShell snapin if needed
if ((Get-PSSnapin -Name Microsoft.SharePoint.PowerShell -ErrorAction SilentlyContinue) -eq $null)
{
    Write-Host "Loading the SharePoint PowerShell snapin..."
    Add-PSSnapin Microsoft.SharePoint.PowerShell
}	
	
$SPWeb = Get-SPWeb $Web -EA SilentlyContinue
if ($SPWeb -eq $null)
{
    Write-Error "$Web is not a valid SharePoint Web"
}
else
{
    Try
    {	
        $fieldID = "61cbb965-1e04-4273-b658-eedaa662f48d"
        [Guid]$AudFieldID = New-Object System.Guid($fieldID)
		
        $list = $SPWeb.Lists[$ListName]
        if ($list -ne $null)
        {
            # Check if audience targeting is enabled on this list.
            $audField = $list.Fields[$AudFieldID]
            if ($audField -ne $null)
            {
                # It's enabled, disable it.
		$list.Fields.Delete($audField.InternalName);
		$list.Update()
		Write-Host -ForegroundColor Green "Audience targeting is succesfully disabled on '$ListName'"
            }
            else
            {
                Write-Host -ForegroundColor Yellow "Audience targeting is not enabled on '$ListName'"
            }
        }
        else
        {
            Write-Host "The list with the name $ListName was not found on $($SPWeb.Url)"
        }
    }
    catch
    {
        Write-Error $_.Exception
    }
    finally
    {
        $SPWeb.Dispose()
    }
}