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I have just bought the Uptown theme and installed it in a nopCommerce 4.30 site.
After adding the required keys to the Social Network configuration for my Twitter account I saved the settings and pressed the Authorize button.
This opens a popup which shows the following XML code:

<?xml version='1.0' encoding='UTF-8'?><errors><error code="417">Desktop applications only support the oauth_callback value 'oob'</error></errors> - Please visit the LINQ to Twitter FAQ (at the HelpLink) for help on resolving this error.

Seems like the Social Feed plugin is using an old authentication method?