Not sure if it’s a real fact or one of those made up things we Al collectively believe… But don’t we have a hard limit of thr number of close people we can keep track of based on our initial tribal evolution? Iirc it’s around 50. So yeah if someone drops off the radar on social media it’s hard to notice sometimes.
Reaching out is often intimidating, it comes with the risk of being rejected which can hurt way, way more than being forgotten.