I would pick something popular and unsexy; make it easy to google for advice, make it easy to hire folks, make it easy to onboard them.
A cautionary tale: my employer leaned hard into Elixir; but now, most of the people who know Elixir well have left. I am probably in the top ten, maybe top five, of the remaining engineers when it comes to Elixir knowledge, and I don't know much.
A stack that's already proven to work, that someone else runs for me at as much little cost to me as possible while I collect the metrics I need to decide if there's a business.
In here I propose using private Facebook groups.
If I were making a POC social network site, I would already have had run some user studies for the initial seed group of users to understand why the existing social network sites arn't working for them or why they havn't already used one of the existing social network platforms to create a group.
Let's assume, I find that the initial seed group of users are a group of single mothers who don't want to remarry and are perfectly fine being friends with other women - their main problem is they don't want men to bother them.
I would then create a private Facebook group and invite these single mothers and see if this private social network obtains the engagement I thought it could reach.
Recently I've been playing with Blazor+WASM and that's looking really promising and allows sharing C# code between client and server (and potentially a native desktop app as well), and to me is more ergonomic to program in, but I haven't used it for anything non-trivial yet.
My other thought would be to go 100% Node.js and use Svelte, and Node might be the better idea actually, because you can choose a framework and just do exactly the project structure they want you to do, and it's pretty great.
I don't think I'd ever willingly touch PHP, the whole entire model of separate Apache/PHP/Database/etc pretty much makes anything you build depend on containers or manual setup.
I've never done anything on the cloud(I work in embedded controls) aside from a personal site on HostHatch.
Can someone tell me honestly if rails is still relevant?
I've been thinking about learning some front-end but am baffled by the amount of choices I need to make about the platform. I maintain a simple CRUD site that runs on PHP, I'd like to rewrite it such that when the users ask for a small change its not a multi-day adventure.
add media press plugin and wordfence and go from there.
I'm hoping to see a bridge or rss export / import with mastodon and matrix (could already exist, dunno atm)
phpfox seems to still be doing things - but I haven't had time to delve into it in years.
Db :SQLite
backend: rocket