But this time, it isn’t just the paparazzi following Ms. Spears’s every move; social media is the new tabloid, where anyone can play the role of gossipmonger. Today, even messy eyeliner or an untidy household have become enough for onlookers — whether they’re anonymized social media users, clout-chasing influencers or figures with varying degrees of connection to Ms. Spears’s past — to call for Ms. Spears’s conservatorship to be reinstated, stripping her yet again of the ability to make her own decisions. So why on earth is anyone listening to them?