COLIN WALKER — I read with interest an article by Dan Schawbel over at the Personal Branding Blog which claims that Twitter is now dead as a marketing platform. His reasoning is that as the number of users on Twitter increases and we all start following more people your tweets will get lost among the noise. Dan defines a marketing platform as "a mass communication tool that allows you convert subscribers (readers/fans) into leads" but goes on to say "It’s not about brand awareness or customer support"...