[tosh]

I wonder how many verticals can be built upon facebook's core concept of sharing thoughts and photos just by carving out a niche and doubling down on it.

I guess this is another instance of the higher level arc of use-case unbundling in the mobile space.

Another recent example would be Product Hunt as unbundled 'show hn'. Food for thought.

[papauschek]

no doubt, journi is a niche product, as I built it for people on the go. What I saw on FB is that users are tired of people over-spamming their timeline with vacation photos. And other users don’t want to share certain things on facebook because the data might be too private or too spammy for others. And last but not least, it’s hard to recover important moments on facebook. Moments easily get lost in your timeline or your friends streams and stay there unnoticed.

[Spooky23]

I think that it is nearly unlimited.

Facebook's size is a limitation. They have over a billion users. Any change they make needs to able to deal with the lowest common denominator.

You can deliver value to niche markets by focusing on their needs & workflow. The "niches" can be millions of people doing a defined scope of tasks.