Thank you for the advice :) It is deeply appreciated. As you guessed, I am just starting out. I felt out what I thought might be a good idea and trying to allow it to grow into its own. Actually a few people have already stated that they would like facebook login so I may need to rework my account model. I don't really have many users right now so this might be a good time to pivot.
As far as donations and sponsors, I agree with you on the donations but confused how I will be able to generate revenue at the start. I currently am a freelancer and funding would allow me to work on this full time but, again, this may be too early in the idea to think about so you may be right on both of those fronts.
I am currently looking into Appcelerator's Titanium for the mobile app at least for a prototype. As for co-founder, my brother has a stake in the idea and is a bit of a designer/illustrator and has presented quite a few good ideas that we coalesced into what the site is currently.
As for scalabilities sake, we were going to look at Node.js as a technology as we may have a lot of realtime features on the website but, again, I didn't want to work that far ahead as I knew there would be some pivoting of my strategy.
Definitely. I could watch the posting trends and build categories off of the postings. e.g. users post a lot of recipes thus I would create a recipe category.
Definitely helps, thank you :) So maybe more than just sharing coffee pictures. Maybe links as well :) Possibly rendering/generating a screenshot of the website as the image itself would do.
Yeah that is why I said it is too early to tell that it is. As for going to a coffee shop and asking people, how do you think I should go about that. I wouldn't want to go sit down at a random table and be like "Hey you, what do you think of this idea". Maybe my head is in the wrong place as far as customer discovery is concerned :) Thank you for the advice.