yeah it's working

twitty.php

@@ -0,0 +1,66 @@
+<?php
+namespace Grav\Plugin;
+
+use Grav\Common\Page\Page;
+use Grav\Common\Plugin;
+
+class TwittyPlugin extends Plugin
+{
+	private $code = '<div class="container" align=center><a class="twitter-timeline" href="https://twitter.com/TWITTYNAME" data-widget-id="542690156990697473">Tweets de @TWITTYNAME</a><script>!function(d,s,id){var js,fjs=d.getElementsByTagName(s)[0],p=/^http:/.test(d.location)?"http":"https";if(!d.getElementById(id)){js=d.createElement(s);js.id=id;js.src=p+"://platform.twitter.com/widgets.js";fjs.parentNode.insertBefore(js,fjs);}}(document,"script","twitter-wjs");</script></div>';
+
+    public static function getSubscribedEvents()
+    {
+    	return [
+	      'onPluginsInitialized' => ['onPluginsInitialized', 0]
+	    ];
+    }
+
+
+
+    //public function onPluginsInitialized(Event $event)
+    public function onPluginsInitialized()
+    {
+	$this->enable([
+	      'onPageInitialized'     => ['onPageInitialized', 0]
+    	]);
+    }
+
+    public function onPageInitialized()
+    {
+	    $this->mergeConfig($this->grav['page']);
+	    if ( $this->config->get('plugins.twitty.enabled') ) {
+		      $page   = $this->grav['page'];
+		      $twig   = $this->grav['twig'];
+		      $uri    = $this->grav['uri'];
+		      $options = $this->config->get('plugins.twitty');
+		      $twittyUsername = $this->config->get('plugins.twitty.twittyUsername');
+          	
+		      //Read page and replace 
+		      $page->content($this->processHtml($page,$twittyUsername));
+	    }
+    }
+   
+    private function processHtml($page,$twittyUsername)
+    {
+    	$content = $page->content();
+
+	$replace = array('TWITTYTEXT'=>$this->code,'TWITTYNAME'=>$twittyUsername);
+	return str_replace(array_keys($replace),array_values($replace), $content);
+
+    }
+
+  
+
+
+   private function mergeConfig( Page $page )
+   {
+   	$defaults = (array) $this->config->get('plugins.twitty');
+    	if ( isset($page->header()->twitty) ) {
+      		$this->config->set('plugins.twitty.enabled', true);
+    	} else {
+      		$this->config->set('plugins.twitty.enabled', false);
+    	}
+   }
+
+}
+?>