by Bjørn Johansen on WordPress.org

Go to https://twitter.com/settings/widgets to create and customize your Twitter Widget. Note the Twitter Widget ID in the HTML code, as you need it later.
Twitter Widget for Embedded Timelines. Create one at https://twitter.com/settings/widgets first.
Use the official HTML widgets from Twitter (https://twitter.com/settings/widgets), but is WordPress-Widgetized and performance optimized so there’s only one script-element which is loaded in page footer, and the external JS is loaded on the window.load event.