That's right. What the current batch of social networks are missing is good tools for knowledge consolidation; there are no tools more complex than the single thread intermixed with comments.

A knowledge graph would work more as a Wikipedia of personal projects and topics of interest, with the possibility to build special data visualizations on top of it. For example, this could be the perfect medium for building distributed discourse aggregators of opinions and rational debates, like Kialo[1] and Parlia[2] but without a single company controlling the content. Social networks transform these debates into confrontations, while a structured knowledge tool could create a structured knowledge base from this kind of exalted conflicting positions.

[1] https://www.kialo.com/

[2] https://www.parlia.com/