Lock-in is a bit of a myth, or more precisely, everything "locks you in". If you start with a LAMP stack, or Rails, or .Net it's going to be very expensive to c

Lock-in is a bit of a myth, or more precisely, everything "locks you in". If you start with a LAMP stack, or Rails, or .Net it's going to be very expensive to change that once your business is off the ground. This is because the main costs are developer time and time-to-market/opportunity costs. Regardless of platform, a wholesale rewrite is rarely viable. Facebook is still on PHP, and have had to take heroic measures to avoid moving to another language.