https://jetpack.com/blaze/

Looks like Jetpack is getting into the ad space leveraging WordPress.com and Tumblr.com with a product called "Blaze".

Saw this by an ad in my own website back end as a result of the Jetpack plugin with a text ad that read:

Reach more people across millions of sites. Promote your content on the WordPress.com and Tumblr ad network using Blaze.