WPCOM_Widget_Facebook_LikeBox::normalize_int_value() – Normalize an integer value within a given range.
wpcom_youtube_embed_crazy_url_init() – Add a new handler to automatically transform custom Youtube URLs (like playlists) into embeds.
wpcom_youtube_embed_crazy_url() – For bare URLs on their own line of the form http://www.youtube.com/v/9FhMMmqzbD8?fs=1&hl=en_US
youtube_link_callback() – Callback function for the regex that replaces YouTube URLs with YouTube embeds.
youtube_sanitize_url() – Normalizes a YouTube URL to include a v= parameter and a query string free of encoded ampersands.