Show HN: Seven39, a social media app that is only open for 3 hours every evening

It's an interesting idea, but if it's only open at a convenient time for a particular group, it's going to lack diverse and worldwide perspectives, and those are important for building a welcoming ecosystem. I doubt giving each timezone its own 3 hours would work, but perhaps rotating the 3 hours each day so that it's anchored on a different timezone would encourage that diversity of content and perhaps even encourage creating connections across timezones.

That said, if you've had success with it in a friend group, perhaps that suggests it's a nice mechanism for a group chat app, rather than for a public social media site?

> It's an interesting idea, but if it's only open at a convenient time for a particular group, it's going to lack diverse and worldwide perspectives, and those are important for building a welcoming ecosystem.

This sounds like a nice sentiment, but I don't think this is strictly true. I would go as far as to say that it is largely untrue. Diverse and worldwide perspectives may damage building a welcoming ecosystem. Whatsapp for example is probably the most popular social media site across the world, and thats because different groups close off themselves into private chat groups.

Take a look at Nairaland, one of the most popular Nigerian social media sites. The content on that site would most certainly not be welcome on any of the silicon valley run sites.