FB is very clearly deeply invested in convincing people to over-share by accident or habit, yeah. It makes their network more addictive, and they know it, so they press that button as hard as possible while building things that technically satisfy niches.

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I quite liked G+'s focus on choosing your audience. Because you have sub-groups even within small, tightly-knit friend groups; when you raise that number into the hundreds it's only more true, not less. It was a mostly-effective UX for embracing that, and it led to my feed being dramatically more relevant.

Mastodon is filling a similar purpose for me, lately. The server you join has a pretty powerful impact on your local timeline - join a couple, use them as targeted sharing / browsing groups, and it's working much better for me than any algorithmic sorting ever did.