iMessage + iCloud for Android. 4 Million users. 7 Billion messages. 55% DAU/MAU

The easiest and most private way to share things with your significant other (YC W12)

HIPAA-Compliant Group Communication Platform, YC W2012, StartX F2011

Web & Smartphone Instant Messanger with 250m downloads.

The Global SMS and Voice API

Hands free voice texting (YC W12)

Real-time mobile communication

Instant, affordable audience response without clickers, using any mobile device.

1-to-1 marketing on a mass scale to help SMBs actively reach, engage and reward consumers

Let your friends make decisions for you.

Mail Chimp for SMS and Social Marketing

The Only Fully Integrated, Text-Powered, Sales Acceleration Tool for Salesforce Users

OpenTable for no reservation restaurants

Answers for everyone.

GROU.PS is a social groupware platform with 3.5MM muv. It's the Y! Groups of Facebook era

Mobile & Social Marketing

Mobile research and marketing in the developing world

Create your mobile social network in ten seconds

Social Mobile Calendar on Facebook

Turnkey mobile marketing and display advertising for SMBs.