Spammers continue to harvest email addresses from public spaces on the web, but ISPs using anti-spam technology block the vast majority of spam sent to those addresses, according to the Federal Trade Commission, writes DM News. The FTC studied address harvesting, ISP spam filtering and the use of "masked" email addresses to prevent address harvesting of addresses. Addresses posted in chat rooms, message boards, USENET groups and blogs were much less likely to be harvested.