At various times throughout the day, there is a sudden influx of pervs coming into our chat room all at once.  I attempted to use server var $_SERVER['HTTP_REFERER'] to check where the links are coming from and my own logging code is showing that field either empty or sometimes "www.google.com" with no query terms in the url.   I thought maybe they were using Incognito mode but when I finally accessed the apache logs, the full refer entries were there.  They're just not getting passed to php as near as I can tell.