As per the article, 13-17 year olds are using more than twice as many texts per month (~3300/mo) as 18-24 year olds (~1600/mo). After seeing the recent surge in

As per the article, 13-17 year olds are using more than twice as many texts per month (~3300/mo) as 18-24 year olds (~1600/mo). After seeing the recent surge in email-based startups, where are all the startups focusing on SMS?