just a heads up, you don't only need to change the proxy, you also need to clear cache and cookies every time, otherwise you leave a big trace that fb sees immediately. Not sure what you mean about not getting connection to the internet, you mean you set you proxy and it doesn't work? are you sure you're using it correctly? some proxies give you a username and password, others just an ip and you need to log into their admin panel and white list your own ip so that proxy only works when it's used from your ip.