Facebook responds to Yahoo’s patent infringement suit with one of its own. Included in the assault are two patents from Mark Zuckerberg himself. “Take that, Yahoo, our CEO’s got tech chops!” AllThingsD has the document and for some reason thinks this couldn’t come at a worse time for Yahoo, that has layoffs looming. Who’s got the bad timing? Isn’t Facebook trying to go public? If there are things that can surely break business planning, but for which execs can only plan defensive scenarios for, they’ve got to include patent suits and government regulation.