gistfile1.html

<script type="text/javascript" data-app-id="YOUR-APP-ID" src="https://assets.yammer.com/platform/yam.js"></script>
<script>
yam.getLoginStatus(function(response) {
  if (response.authResponse) 
	{
		//GET THE TOKENS FOR ALL MY NETWORKS
	   	yam.request({
			url: "https://www.yammer.com/api/v1/oauth/tokens.json",
			method: "GET",
			success: function(msg) {
				var access_token = "";
				for (var i=0; i < msg.length; i++) {
					//GRAB THE TOKEN FOR THE DESIRED NETWORK
					if (msg[i].network_permalink == "TARGET_NETWORK_PERMALINK")
					{
						console.log(msg[i].network_permalink)
						access_token = msg[i].token;
						break;
					}
				};
        
        //request messages for the target network
        yam.request({
					url: "https://www.yammer.com/api/v1/messages.json",
					method: "GET",
					beforeSend: function (req) {   //send the access_token in the HTTP header
						req.headers.Authorization = "Bearer " + access_token;
					},
					success: function(msg) {
						console.log(msg);
					},
					error: function(msg) {
						console.log(msg);
					}
				});
				
			},
			error: function(msg) {
				console.log(msg);
			}
		});
	}
    else 
    { 
		yam.login(function(response) { 
			if (response.authResponse) 
			{
				console.log("you're logged in now, please reload the page");
			} 
		});
	}
});
</script>