Launching an application with an explicit Intent to a specific Instagram user using the Share ANE

distriqt.extension.share.applications.launch.as

var app:Application = new Application( "com.instagram.android", "instagram://" );

var options:ApplicationOptions = new ApplicationOptions();
options.action = ApplicationOptions.ACTION_VIEW;
options.data = "http://instagram.com/_u/distriqt";
options.parameters = "user?username=distriqt";
 
if (Share.service.applications.isInstalled( app ))
{
	Share.service.applications.launch( app, options );
}

// com.distriqt.Share

http://airnativeextensions.com/extension/com.distriqt.Share

A useful resource of iOS URL schemes:

http://wiki.akosma.com/IPhone_URL_Schemes