An anonymous reader writes "Website blocking has become a hot topic in the UK in recent weeks. Opponents of both voluntary and court-ordered blockades have warned about the potential collateral damage these blocking systems may cause, and they have now been proven right. As it turns out blocked sites can easily exploit the system and add new IP-addresses to Sky's blocklist. As a result TorrentFreak has been rendered inaccessible to the ISP's four million customers."
