I would have to disagree with this. I certainly don't like this general mentality that seems to engulf the Web 2.0 world. It is the same mentality that made the .com boom bust. A business needs to make money. That is why it is a business. I can side on not having a business plan, being flexible is very important. But to not have a business model or any foreseeable way of making money is just stupid. A business that generates no revenue is a collective hobby, nothing more.
If Twitter generates enough traffic they can revenue share from the cell phone companies. So they have a business model already. I get the feeling that they don't want people to know this.
I don't get how this works. They want cell phone manufactures to pay them money for having an integrated twitter client? I know Twitter is pretty big in the valley and amongst geeks, but I don't see them getting enough market penetration for the cell phone companies to consider doing this, let alone pay for it. I know that Nokia has teamed up with Jaiku, but I doubt Jaiku is getting money out of this. It seems like Nokia is just doing this for fun and to show Finnish nationalism.