Jonah Peretti, chief executive of BuzzFeed, says intrusive, terrible third-party software has led to a surge in ad blocking. Speaking at Mindshare Huddle yesterday. Peretti said publishers were responsible for a "weird misalignment" -- using online advertising and tracking software that "don't care about the reader." "They are slow and show ads that are terrible. We build our own native advertising model, which is not impossible to block but it's more intelligent and tied into the experience better."