Days after Facebook had revealed the Portal and Portal Plus, direct rivals to Amazon’s Echo Show, Google waded into the smart home video conferencing space with its Google Home Hub. Evidently, video calling is a killer app, drawing the eye of these web giants, but Facebook’s support for Alexa, and apparent enthusiasm for a Google Assistant integration, could provide a neutral host with huge reach for the two camps. Lenovo actually beat Google to market with a video-screen hub based on Google Assistant. Amazon was first out, although the first Echo Show did look a lot less polished than the updated version launched a few weeks ago. For all these devices, there’s not exactly much in the way of clamor…