The hashtag is "owned" by Fifth Harmony (and their Work from Home ft. Ty Dolla $ign video clip). You have to scroll down several posts before you get to the work from home related results. It's been like that for almost a year. I wonder if Twitter will ever address that. On the other hand... over a billion views? Wow.
That's a new information for me. I have been using twitter for years now but never know anything about this so thanks for sharing this information