It changes depending on the day. But yes, some days it's really a lot (affecting forums, news sites, etc.). I think Movistar applies stronger blocks than most for some reason, in fact I've been seriously consider changing ISP for that reason but I'm too lazy (plus in 12 years with them I think I've had a single outage which was solved in an hour or two, so even if I oppose them morally, it's convenient to stay...)