[thekaleb]

A quick Google search shows that iMessage does have the prerequisite 100 million active users.

[unilynx]

What did you find? I only see a global number, but this proposal requires 100million MUA in the USA

With some quick searches, multiplying iPhone's 39% marketshare with 328million Americans gets me to 127million, but that's probably too high - not everyone has a smartphone, and how many users actually use iMessage at least once a month, and not say, WhatsApp exclusively ?

[sedatk]

iMessage exists on iPad and Macbooks too.