diff --git a/plugin-name/class-plugin-name.php b/plugin-name/class-plugin-name.php
index fd7510f..91e2d68 100644
--- a/plugin-name/class-plugin-name.php
+++ b/plugin-name/class-plugin-name.php
@@ -67,6 +67,9 @@ class Plugin_Name {
 
 		// Load plugin text domain
 		add_action( 'init', array( $this, 'load_plugin_textdomain' ) );
+		
+		// Activate plugin when new blog is added
+		add_action( 'wpmu_new_blog', array( $this, 'activate_new_site' ) );
 
 		// Add the options page and menu item.
 		// add_action( 'admin_menu', array( $this, 'add_plugin_admin_menu' ) );
@@ -115,7 +118,22 @@ class Plugin_Name {
 	 * @param    boolean    $network_wide    True if WPMU superadmin uses "Network Activate" action, false if WPMU is disabled or plugin is activated on an individual blog.
 	 */
 	public static function activate( $network_wide ) {
-		// TODO: Define activation functionality here
+		if ( function_exists( 'is_multisite' ) && is_multisite() ) {
+			if ( $network_wide  ) {
+				// Get all blog ids
+				$blog_ids = self::get_blog_ids();
+
+				foreach ( $blog_ids as $blog_id ) {
+					switch_to_blog( $blog_id );
+					self::single_activate();
+				}
+				restore_current_blog();
+			} else {
+				self::single_activate();
+			}
+		} else {
+			self::single_activate();
+		}
 	}
 
 	/**
@@ -126,6 +144,75 @@ class Plugin_Name {
 	 * @param    boolean    $network_wide    True if WPMU superadmin uses "Network Deactivate" action, false if WPMU is disabled or plugin is deactivated on an individual blog.
 	 */
 	public static function deactivate( $network_wide ) {
+		if ( function_exists( 'is_multisite' ) && is_multisite() ) {
+			if ( $network_wide ) {
+				// Get all blog ids
+				$blog_ids = self::get_blog_ids();
+
+				foreach ( $blog_ids as $blog_id ) {
+					switch_to_blog( $blog_id );
+					self::single_deactivate();
+				}
+				restore_current_blog();
+			} else {
+				self::single_deactivate();
+			}
+		} else {
+			self::single_deactivate();
+		}
+	}
+
+	/**
+	 * Fired when a new site is activated with a WPMU environment.
+	 *
+	 * @since    1.0.0
+	 *
+	 * @param	int	$blog_id ID of the new blog.
+	 */
+	public function activate_new_site( $blog_id ) {
+		if ( 1 !== did_action( 'wpmu_new_blog' ) )
+			return;
+
+		switch_to_blog( $blog_id );
+		self::single_activate();
+		restore_current_blog();
+	}
+
+	/**
+	 * Get all blog ids of blogs in the current network that are:
+	 * - not archived
+	 * - not spam
+	 * - not deleted
+	 *
+	 * @since    1.0.0
+	 *
+	 * @return	array|false	The blog ids, false if no matches.
+	 */
+	private static function get_blog_ids() {
+		global $wpdb;
+
+		// get an array of blog ids
+		$sql = "SELECT blog_id FROM $wpdb->blogs
+			WHERE archived = '0' AND spam = '0'
+			AND deleted = '0'";
+		return $wpdb->get_col( $sql );
+	}
+
+	/**
+	 * Fired for each blog when the plugin is activated.
+	 *
+	 * @since    1.0.0
+	 */
+	private static function single_activate() {
+		// TODO: Define activation functionality here
+	}
+
+	/**
+	 * Fired for each blog when the plugin is deactivated.
+	 *
+	 * @since    1.0.0
+	 */
+	private static function single_deactivate() {
 		// TODO: Define deactivation functionality here
 	}