I think updating people with push events on topics they care about is a great concept.

I've built a related tool to send me a text message when a new episode of Silicon Valley is released online. It also tracks when the local snowboarding resorts have opened for this season, as the date varies widely and shockingly enough their advice is "check our website every day"... get real. It's been immensely valuable to me personally.

As far as validation goes, and I'm saying this intentionally without clicking through to look at your prototype, it's just: Do you have users? How much are they using? Really you want to know is it providing significant value to them, but that's harder to measure at this stage. Then eventually, are people willing to pay for it?

I would recommend you create a single-page marketing site, it doesn't even need to use any tech, just pure html and css, that explains: what the problem is, use cases people would have, some recommendations from early stage users eg your friends, and a sign up button. That's what most startups do.