diff --git a/sharethis.api.php b/sharethis.api.php
new file mode 100644
index 0000000..448d855
--- /dev/null
+++ b/sharethis.api.php
@@ -0,0 +1,23 @@
+<?php
+
+/**
+ * @file
+ * Hooks provided by the sharethis module.
+ */
+
+/**
+ * Provide a sharethis_render alteration.
+ *
+ * @param array $attributes
+ *   This has url, title, class and display text for the particular
+ *   sharethis-button.
+ * @param array $data_options
+ *   This has all the configuration settings for sharethis.
+ */
+function hook_sharethis_render_alter(array &$attributes, array &$data_options) {
+  // Change the st_username in attributes.
+  $attributes['st_username'] = t('newuser');
+
+  // Change the twitter_handle in data_options.
+  $data_options['twitter_handle'] = t('New twitter handle.');
+}
diff --git a/sharethis.services.yml b/sharethis.services.yml
index bff458e..0132e9c 100644
--- a/sharethis.services.yml
+++ b/sharethis.services.yml
@@ -3,4 +3,4 @@ services:
     class: Drupal\sharethis\SharethisManager
     tags:
       - {name: sharethis_manager}
-    arguments: ['@config.factory', '@title_resolver', '@renderer', '@current_route_match', '@request_stack']
+    arguments: ['@config.factory', '@title_resolver', '@renderer', '@current_route_match', '@request_stack', '@module_handler']
diff --git a/src/SharethisManager.php b/src/SharethisManager.php
index 674bdc3..5871c9f 100644
--- a/src/SharethisManager.php
+++ b/src/SharethisManager.php
@@ -11,6 +11,7 @@ use Drupal\Component\Utility\Html;
 use Drupal\Component\Utility\Unicode;
 use Drupal\Component\Serialization\Json;
 use Drupal\Core\Controller\TitleResolverInterface;
+use Drupal\Core\Extension\ModuleHandlerInterface;
 use Symfony\Component\HttpFoundation\RequestStack;
 
 /**
@@ -54,6 +55,13 @@ class SharethisManager implements SharethisManagerInterface {
   protected $requestStack;
 
   /**
+   * The module handler.
+   *
+   * @var \Drupal\Core\Extension\ModuleHandlerInterface
+   */
+  protected $moduleHandler;
+
+  /**
    * Constructs an SharethisManager object.
    *
    * @param \Drupal\Core\Config\ConfigFactoryInterface $config_factory
@@ -62,13 +70,16 @@ class SharethisManager implements SharethisManagerInterface {
    *   The Title Resolver.
    * @param \Drupal\Core\Render\RendererInterface $renderer
    *   The renderer service.
+   * @param \Drupal\Core\Extension\ModuleHandlerInterface $module_handler
+   *   The module handler.
    */
-  public function __construct(ConfigFactoryInterface $config_factory, TitleResolverInterface $title_resolver, RendererInterface $renderer, RouteMatchInterface $route_match, RequestStack $request_stack) {
+  public function __construct(ConfigFactoryInterface $config_factory, TitleResolverInterface $title_resolver, RendererInterface $renderer, RouteMatchInterface $route_match, RequestStack $request_stack, ModuleHandlerInterface $module_handler) {
     $this->configFactory = $config_factory;
     $this->titleResolver = $title_resolver;
     $this->renderer = $renderer;
     $this->routeMatch = $route_match;
     $this->requestStack = $request_stack;
+    $this->moduleHandler = $module_handler;
   }
 
   /**
@@ -255,6 +266,10 @@ class SharethisManager implements SharethisManagerInterface {
       if (!empty($type)) {
         $attributes['displayText'] = Html::escape($display);
       }
+
+      // Alter to allow other module to change or add attribute and data_options elements.
+      $this->moduleHandler->alter('sharethis_render', $attributes, $data_options);
+
       $meta_generator = array(
         '#type' => 'html_tag',
         '#tag' => 'span',