I’ve only dabbled, but my impression is that mastodon and micro.blog are oriented towards building “online” communities like Twitter, ie communities of interest

I’ve only dabbled, but my impression is that mastodon and micro.blog are oriented towards building “online” communities like Twitter, ie communities of interest with people you likely do not know in real life. Facebook and to some extent Instagram seem to be most often used to share within pre-existing offline networks; ie you might use it to follow life updates from someone that you also see in person on occasion. This works because everybody is on it — you don’t have to hope that your acquaintance from college (or whatever) has picked the same instance as you. Is there an “indie” real-life-network alternative? Is that what Diaspora is intended to be?