Sponsored posts on Tumblr for brands like Lexus, Lipton, and “Hunger Games” will start showing up on Yahoo sites. This cross-platform integration makes perfect sense, given Yahoo’s continuous efforts in integrating the microblogging platform it purchased last year into its business. Plus, for the image-heavy digital magazines sites like Yahoo Tech, Tumblr already serves as the editorial publishing tool for these sites and has been used to create those sites’ ads since their introduction.