By representing itself both as an open platform and as a company with progressive values, Twitter has put itself into an awkward in-between spot and is bound to create such controversies.
not going to happen because apparently people paying with their attention instead of dollars in manipulative ways is just fine. the argument goes that they can always not read it, but that's a false dichotomy in social networks and why i'd like to see twitter, google and facebook get labeled as utilities.