Charting Twilio’s Growth Over The Last Year (And The Price Drops That Helped)
techcrunch.com
techcrunch.com
The only unfortunate part for Twilio is they can't expect to repeat the process and still grow their revenue, since now they're down to 1 cent per SMS. (Unless they move to fractions of a cent...)
For example, 2.3¢/min is currently listed at http://www.skype.com/intl/en-us/prices/payg-rates/