I have attempted to follow the steps for creating the Twitter feed widget, as found here: https://twitter.com/settings/widgets
When you click "create new", you are taken to a separate "publish.twitter.com" subdomain in which you don't seem to be able to persistently a new widget. You can produce an embed code.
This embed code is very similar to the current embed code in the module, but there is a Javascript error when passing the widget_id for *new* sites that now seem to not be able to produce a widget id.
I'll be submitting a patch that removes the required form value for new Twitter feed instances.
Fixed
2.0
Code
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
Issue #2751845 by nerdstein, ckoppenhaver, hassebasse, pheski,...
As the last issue for 7.x went ahead and pushed this.
Automatically closed - issue fixed for 2 weeks with no activity.