MediaPost: The free ride is over for brands on BuzzFeed. The online publisher has frozen all community brand publisher accounts. Brands were made aware of the change in an email sent out earlier this week. BuzzFeed’s team said it will now pounce on posts that try to sell something, have an overt political or commercial agenda, or appear to use the online publisher’s brand as an implicit endorsement of a product or a political position. In place of the community accounts, BuzzFeed is now encouraging brands to buy advertising on its site.