Twitter widgets are no longer displaying in Internet Explorer 7 and 8
Twitter widgets are no longer displaying in IE7 or IE8. Instead, you will only see
Loading Widget #123456789
In late 2014, Twitter removed support for widgets in Internet Explorer 7. In January 2015, they removed support for Internet Explorer 8 as well.
For more information see this announcement from Twitter.
The only available resolution is to use a browser that is supported by Twitter.
See this page for supported browsers.