Is there a common place on the internet for such discussions? A site where people can share ideas and find people to work together.
I have been reading it for the past few months, the traffic is pretty low and it's a bit marketing guide heavy at times, but overall an interesting community IMHO.
The topic may work better on a more general board like HN, and I hope it will continue to appear here occasionally (without filtering).
is one - for sharing ideas and getting feedback. I've read a few interesting threads and advice and results there. Also, their site design and appearance are interesting (though a side point).
I guess ProductHunt too, though haven't checked that a lot (yet).
However, it's overwhelmingly filled with people who have pretty low ambitions. It's mostly projects that are better suited for an etsy store than they are as a stand-alone startup. The ones with more ambition are usually something like "Uber for dogs" or "Facebook for dogs" and lack any real possibility of ever becoming a meaningful product.