Starting today, you'll see things like promotional GIFs for Denny's in your web Tumblr feed (just like you had before via mobile), according to the company's staff blog. "These posts will simply blend in with the posts from the blogs you follow," says Tumblr, except that advert posts will be stamped with a dollar sign with lines shooting out of it.
This should come as a surprise to no one post-Yahoo (you gotta make money!), and will come to the massive disdain and face-clutching of teens across the world. Tumblr, tellingly, disabled reblogs on the announcement post, so the chorus of FUCK YOU MARISSA wouldn't appear.