New Twiddle

components.share-box.js

import Ember from 'ember';

export default Ember.Component.extend({
  shareText: '',
  
  actions: {
    onShareEditorValueChanged(shareEditorValue) {
      this.set('shareText', shareEditorValue);
    },
    onSelectHashtag(text) {
      console.log("Select hashtag ", text);
    }
  }
});

components.share-editor.js

import Ember from 'ember';

export default Ember.Component.extend({
  value: null,
  
  actions: {
    onValueChange() {
      this.get('onValueChange')(this.get('value'));
    },
  }
});

components.share-suggestions.js

import Ember from 'ember';

export default Ember.Component.extend({
  actions: {
    onSelectText(text) {
      this.get('onSelectText')(text);
    }
  }
});

controllers.application.js

import Ember from 'ember';

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

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{share-box}}
<br>
<br>

templates.components.share-box.hbs

{{share-editor onValueChange=(action "onShareEditorValueChanged")}}

{{share-suggestions onSelectText=(action "onSelectHashtag")}}

<p>Share text is:</p>
{{shareText}}

templates.components.share-editor.hbs

{{textarea input=(action "onValueChange") value=value}}

templates.components.share-suggestions.hbs

<button onclick={{action "onSelectText" "#hashtag1"}}>#hashtag1</button>

<button onclick={{action "onSelectText" "#hashtag2"}}>#hashtag2</button>

twiddle.json

{
  "version": "0.12.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.12.0",
    "ember-template-compiler": "2.12.0",
    "ember-testing": "2.12.0"
  },
  "addons": {
    "ember-data": "2.12.1"
  }
}