Building alternative social media

There's a chapter called exactly this, "Building Alternative Social Media" in Anarchist Cybernetics on this.

With a list of desirable features:

• Forums for conversation
• Direct messaging
• Sharing content with meme/viral potential
• News feed with curated and user-generated content
• Public relations function
• Linking alternative and mainstream platforms
• Central resource hub
• Noise and overload filters
• Overuse addiction warning system
• General assembly function
• Pad function
• Memory / narrative
• File sharing and knowledge exchange
• Procrastination
• Online decision making embedded in offline structures
• Sections open to non-members
• Architecture for collective autonomy
• Flexible engagement options
• Responsibility and commitment
• Privacy, security and data
• Easy backup of information

I like this list. Is it solely social media though? What explicitly is social media?

Anyway, I would probably advocate to attain the above in a patterny / Unixy way I feel. i.e. bridge and glue together the different pieces, avoid a behemoth platform.

I suppose a behemoth matters less if it's libre. But it feels like the pieces are already there to glue together, so don't reinvent the wheel.