diff --git a/inc/activities.php b/inc/activities.php
index 767ee6c..7eb0dc4 100644
--- a/inc/activities.php
+++ b/inc/activities.php
@@ -3,7 +3,7 @@ namespace activities;
 
 function get_activity( $id ) {
     global $wpdb;
-    $activity_json = $wpdb->get_var( sprintf(
+    $activity_json = $wpdb->get_var( $wpdb->prepare(
         'SELECT activity FROM activitypub_activities WHERE id = %d', $id
     ) );
     if ( is_null( $activity_json ) ) {
diff --git a/inc/activities/delete.php b/inc/activities/delete.php
index 40d9367..21a7fb4 100644
--- a/inc/activities/delete.php
+++ b/inc/activities/delete.php
@@ -1,5 +1,5 @@
 <?php
-namespace delete;
+namespace activities\delete;
 
 require_once plugin_dir_path( __FILE__ ) . '/../objects.php';
 
diff --git a/inc/activities/like.php b/inc/activities/like.php
new file mode 100644
index 0000000..300034b
--- /dev/null
+++ b/inc/activities/like.php
@@ -0,0 +1,4 @@
+<?php
+namespace activites\like;
+
+?>
diff --git a/inc/actors.php b/inc/actors.php
index 31482bc..603b2df 100644
--- a/inc/actors.php
+++ b/inc/actors.php
@@ -1,7 +1,35 @@
 <?php
 namespace actors;
 
-function get_actor( $user ) {
+function get_actor( $id ) {
+    global $wpdb;
+    $row = $wpdb->get_row( $wpdb->prepare(
+        'SELECT * FROM activitypub_actors WHERE id = %d', $id
+    ) );
+    return get_user_from_row( $row );
+}
+
+function get_actor_by_slug ( $slug ) {
+    global $wpdb;
+    $row = $wpdb->get_row( $wpdb->prepare(
+        'SELECT * FROM activitypub_actors WHERE slug = %s', $slug
+    ) );
+    return get_user_from_row( $row );
+}
+
+function get_user_from_row( $row ) {
+    switch ( $row->type ) {
+    case "user":
+        $user = get_user_by( 'slug', $row->slug );
+        return get_user_actor( $user );
+    case "commenter":
+        return new \WP_Error(
+            'not_implemented', __( 'Commenter actors not yet implemented', 'activitypub' )
+        );
+    }
+}
+
+function get_user_actor( $user ) {
     $handle = get_the_author_meta( 'user_nicename', $user->get('ID'));
     $actor = array(
         "@context" => array( "https://www.w3.org/ns/activitystreams" ),
@@ -25,4 +53,17 @@ function get_actor( $user ) {
     );
     return $actor;
 }
+
+function create_actors_table() {
+    global $wpdb;
+    $wpdb->query(
+        "
+        CREATE TABLE IF NOT EXISTS activitypub_actors(
+            id INT UNSIGNED AUTO_INCREMENT PRIMARY KEY,
+            slug VARCHAR(255) UNIQUE NOT NULL,
+            type VARCHAR(64)
+        );
+        "
+    );
+}
 ?>
diff --git a/inc/init.php b/inc/init.php
index dcabbb9..006b5eb 100644
--- a/inc/init.php
+++ b/inc/init.php
@@ -5,6 +5,7 @@ require_once plugin_dir_path( __FILE__ ) . '/outbox.php';
 require_once plugin_dir_path( __FILE__ ) . '/api.php';
 require_once plugin_dir_path( __FILE__ ) . '/objects.php';
 require_once plugin_dir_path( __FILE__ ) . '/activities.php';
+require_once plugin_dir_path( __FILE__ ) . '/actors.php';
 
 add_action( 'rest_api_init', function() {
     \api\register_routes();
@@ -14,5 +15,6 @@ add_action( 'activitypub_init', function() {
     \activities\create_activities_table();
     \objects\create_object_table();
     \outbox\create_outbox_table();
+    \actors\create_actors_table();
 } );
 ?>
diff --git a/inc/likes.php b/inc/likes.php
new file mode 100644
index 0000000..09ef9cc
--- /dev/null
+++ b/inc/likes.php
@@ -0,0 +1,16 @@
+<?php
+namespace likes;
+
+function create_likes_table() {
+    global $wpdb;
+    $wpdb->query(
+        "
+        CREATE TABLE IF NOT EXISTS activitypub_likes (
+            actor_id INT NOT NULL,
+            object_url TEXT NOT NULL,
+
+        );
+        "
+    );
+}
+?>
diff --git a/inc/objects.php b/inc/objects.php
index aa5095c..70f6c52 100644
--- a/inc/objects.php
+++ b/inc/objects.php
@@ -44,7 +44,7 @@ function update_object( $object ) {
 
 function get_object( $id ) {
     global $wpdb;
-    $object_json = $wpdb->get_var( sprintf(
+    $object_json = $wpdb->get_var( $wpdb->prepare(
         'SELECT object FROM activitypub_objects WHERE id = %d', $id
     ) ); 
     if ( is_null( $object_json ) ) {
diff --git a/inc/outbox.php b/inc/outbox.php
index 540a40d..dc112aa 100644
--- a/inc/outbox.php
+++ b/inc/outbox.php
@@ -16,6 +16,7 @@ require_once plugin_dir_path( __FILE__ ) . '/activities.php';
 require_once plugin_dir_path( __FILE__ ) . '/activities/create.php';
 require_once plugin_dir_path( __FILE__ ) . '/activities/update.php';
 require_once plugin_dir_path( __FILE__ ) . '/activities/delete.php';
+require_once plugin_dir_path( __FILE__ ) . '/activities/like.php';
 
 function handle_activity( $actor, $activity ) {
     // TODO handle authentication/authorization
@@ -43,6 +44,7 @@ function handle_activity( $actor, $activity ) {
     case 'Remove':
         break;
     case 'Like':
+        $activity = \activities\like\handle( $actor, $activity );
         break;
     case 'Block':
         break;