This isn’t new. It’s just new to me. I’ve built similar systems myself based on this idea, but IFTTT has done a really nice job of integrating a slew of social media sites and smart phone sensors (well, location anyway) to allow for really simple automation. Besides you just have to love any service where the About link points to a page named wtf.
How do you make wordpress generate a robots.txt file? Or a sitemap?
Easy Peasy. You create and upload your own robots.txt file into the root directory of wordpress. I used this page for hints for a good wordpress robots.txt. That contains the Sitemap link, which you get from the XML Sitemap plugin. And then you kick google Webmaster tools until they show the right thing.