There are two sides to the Internet: the mainstream and the underground. What happens when the underground gets gobbled up by the mainstream? For one thing, it means online pornography gets pushed further to the margins of the web.

Take for example the blogging website Tumblr, heretofore loved by the internet underground, now owned by Yahoo. Yahoo wants Tumblr to make money, and to do that, Tumblr needs to weed out pornography.

Sam Biddle of ValleyWag joins Marketplace Tech host Ben Johnson to discuss.