It's funny, I came with the same idea and implemented it in the social network I'm building https://nmkbs-aaaaa-aaaam-aadfa-cai.ic0.app/post/740#main.
I'm also planning to make it EA aligned at the core.
Some extra questions to think about or just have fun:
1 - Should the feed promote EA aligned posts over others?
2- Should we optimise for active users? Number of posts? Happiness?
3- Should it be running in a centralised server (like EA forum?) or in a decentralised way?
4- What should be the role of crypto inside the social network, if any?
5 - Should users control the network by coin voting?
6- Should users be able to fork the network and quickly create a spin-off?
7 - How should it create revenue and re-direct it to altruistic causes?
I hope is enough to kick start some conversation as I believe having a better social networks and aligned to EA values is vital.
I made a similar question yesterday without being aware of this one https://forum.effectivealtruism.org/posts/ccZCJcqBtWxFLCN2t/how-does-an-ea-aligned-twitter-looks-like