SilverPush is an Indian startup that's trying to figure out all the
different computing devices you own. It embeds inaudible sounds into the
webpages you read and the television commercials you watch. Software
secretly embedded in your computers, tablets, and smartphones picks up
SilverPush. The result is that the company can track you across your
different devices. It can correlate the television commercials you watch
with the web searches you make. It can link the things you do on your
tablet with the things you do on your work computer.