Twitter launched Twitter Kit in 2014: a set of tools app owners use to integrate Twitter data and functionality. Since then, Twitter Kit adoption soared and Twitter increased its functionality. The v2.0 release constitutes the first major revision and a platform for expanded functionality and use.
Our API directory now includes 255 SMS APIs. The newest is the Msg2send API. The most popular, in terms of mashups, is the Twilio SMS API. We list 171 Twilio SMS mashups. Below you'll find some more stats from the directory, including the entire list of SMS APIs.