Trying to validate an idea

Hey PH community 👋

I'm a solo founder from Barcelona. I have this idea that I'm calling a social restaurant discovery app for international travelers (although it can be for locals as well).

What's the problem I have encountered (and talk with friends and family that they have as well):

Most of us, we are discovering restaurants from Instagram reels and TikTok, we might save them or share them in a group chat, but then it gets messy. Maybe one of us saved the location on Google Maps, just to discover that the Restaurant its on the other end of the city from where you are when you're hungry. Also, in places like Japan, Korea or China, the best and most local places are in the local language, so you need to look in Google Maps in Japanese, Chinese, or Korean (which with ChatGPT is simpler). But all this, in my opinion, it’s still messy.
Also, maybe you want to find a new restaurant in the city, we all have that foodie friend that we as for recommendations, but maybe they are not available when we need them (it can happen, they have a life haha), so why not simply go check something that your friend has been to and has rated highly?

What I'm thinking on building:

A simple app that:

• Lets you save restaurants directly from Instagram/TikTok

• Organizes them by city on a map

•  Shows where your friends have actually eaten.

What I'd love from this community:

1. Does "social restaurant discovery" feel like a real category to you, or will people just default to Google Maps?

2. Is the Instagram-save feature or the friend-recommendation layer the actual best feature?

3. Anyone who's built a B2C social app, what killed your retention early on?

If you feel you identify with these problems, who wants to be an early tester, drop a comment. I'm looking for 20 people to shape the product.