The fight, waged on the floor of Congress by representatives variously in the pocket of one company or the another, has even spilled into cyberspace. The F135 engine has its own Facebook page, as well as its own Twitter feed, both of which spend most of their time touting how the F136 engine is expensive and unnecessary. Not to be outdone, the F136 has ITS own Twitter feed, which lets followers know just how much better the F135 is than the F136.