I agree with you completely. My question is what would you build if the technological barrier of building a massive, reliable real time service was not there. Everyone is talking about the Real Time Web (even organizing conferences) but Twitter is the only near-real-time service that comes to mind.
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Nobody pays you money because you solved a technology challenge. Solve problems for people who pay money for solutions to problems.
Some time later, you may run into scaling issues. You can cross that bridge when you come to it. (Or you can pay other people to cross it for you.)
I agree with you completely. My question is what would you build if the technological barrier of building a massive, reliable real time service was not there. Everyone is talking about the Real Time Web (even organizing conferences) but Twitter is the only near-real-time service that comes to mind.