These targeted adverts can gum up the works on your pc, and you wonder why your streaming video when you've used the computer for a while spends a lot of time buffering up. Ideally you should clear your cache every day. Thank God the Chinese have been sensible enough to block google, face/moron-book and such like tripe. Never join facebook because as soon as you do they will search your e-mail, they will know all your contacts; in short they will know everything about you. Thankfully the Chinese don't like to spy on you and compromise your privacy in such ways.