New Twiddle

components.my-feed.js

import Ember from 'ember';
import { inject as service } from '@ember/service';

export default Ember.Component.extend({
  memberLinkService: service('member-link')
});

components.nav-bar.js

import Ember from 'ember';
import { inject as service } from '@ember/service';

export default Ember.Component.extend({
  memberLinkService: service('member-link')
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle'
});

services.member-link.js

import Ember from 'ember';

function getMemberLink() {
  return 'https://emberjs.com';
}

export default Ember.Service.extend({
   init(){
      this._super(...arguments);
      this.set('memberLink', getMemberLink());
   }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{nav-bar}}
{{my-feed}}
{{outlet}}
<br>
<br>

templates.components.my-feed.hbs

<a href={{memberLinkService.memberLink}}>Member Link in my feed</a>

templates.components.nav-bar.hbs

<a href={{memberLinkService.memberLink}}>Member Link in nav bar</a>

twiddle.json

{
  "version": "0.14.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "2.18.2",
    "ember-template-compiler": "2.18.2",
    "ember-testing": "2.18.2"
  },
  "addons": {
    "ember-data": "2.18.2"
  }
}