I find this interesting enough. I've been myself involved in those kind of ideas... but never got to anything.
As other said, there is a big expression space in the web, with room and options for everyone. But the fact is that, as you, many don't like the idea of starting a blog, or just want to be part of something bigger than what they are able to build. Anyways, figuring out exactly where in the map you will fit is very important.
Others forgot to mention old fashioned forums, that also allow people to post thing, open threads, etc. I imagine your product as something in between a forum + posterous easiness + blog network. What could help it a lot is thinking in a specific subject or niche, because that will make the sum of all posts something interesting to dive in (as HN is for some subjects and not others).
And of course, as michaelpinto said: go build a prototype as soon as you can.
As other said, there is a big expression space in the web, with room and options for everyone. But the fact is that, as you, many don't like the idea of starting a blog, or just want to be part of something bigger than what they are able to build. Anyways, figuring out exactly where in the map you will fit is very important.
Others forgot to mention old fashioned forums, that also allow people to post thing, open threads, etc. I imagine your product as something in between a forum + posterous easiness + blog network. What could help it a lot is thinking in a specific subject or niche, because that will make the sum of all posts something interesting to dive in (as HN is for some subjects and not others).
And of course, as michaelpinto said: go build a prototype as soon as you can.