Facebook public posts I make using the Open Graph API are not seen by friends

I'm making a simple Facebook app that posts updates to the user's timeline using node.js and Facebook's Open Graph API. Even though I can see the posts I make using the OG API on my timeline (and it has the globe icon identifying that it's a public post, see pic below), none in my FB friend network can see it.

Here's a screenie of a public post I made via OG API showing up on my timeline, along with a post from a 3rd party app (Pool practice) for comparison:

Now here's the screenie of my friend's timeline showing only the Pool Practice post, the post from my app is nowhere to be seen...

I've checked the app settings and permissions as well as the OG API options, but haven't seen anything that points to how I can solve this problem. Here's the node.js code I'm using to post the updates:

    // app permissions set to 'publish_actions' and 'publish_stream'
    // I do the auth dance here to get the access_token and store it in session as fb_token


    var request = require( 'superagent' ); // module from TJ Holowaychuk similar to "request"
request
    .post( 'https://graph.facebook.com/me/feed?access_token=' + req.session.fb_token )
    .send( { message: 'posting via node.js' } )
    .set( 'Content-Type', 'application/x-www-form-urlencoded' )
    .end( function( response ) {
        log( response );
    });

The code above works and the post shows up on my timeline, but no one else is able to see it. Anyone know a way out of this?