I've seen many forums like you're looking for that people have tried to get going. They all eventually fail or just stay a small group of active members. I've heard people say getting motorcyclists together is like herding cats. If you think about the reasons
why people ride motorcycles you quickly understand why the one size fits all forum/blog you're looking for doesn't exist. There are
many flavors in the moto community, not one forum is going to fulfill their needs. But go out and attend events or join many forums and read lots of blogs and you quickly realize that even though there are many segments in the moto community it's still a small world, and you get to know many. What exactly are you looking for?
As Pakhan posted, I would suggest suspectsunlimited.com
We're a very open group of (mostly) NYC area riders that commute and can do 500mi day rides, and ride at the track, and like to get dirty, some race, some tinker with vintage bikes and have projects going... anything with 2 wheels.
If you're interested in joining a group of people trying to make the moto community better in NYC, there's the
New York Motorcycle & Scooter Task Force If interested in the vintage scene in NYC, there's NYC VinMoto
If interested in meeting riders, there are events on a weekly and annually occurrence.
You can ride over to Bar Matchless on a Monday evening and watch a race from the day before and meet some NYC flavor.
I can go on and on.... again I'm not sure exactly what you're looking for.....
You can always post a question, event, ride here as well..... you will find there are many DMF'rs that don't only own a Monster or a Ducati anymore, or never did. Some if they hang around long enough might be smart enough to never get one.