Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.
Why are only featured questions being shown at this URL?
Before, this URL would show all questions tagged with 'facebook'.
I suspect that you have click "featured" from the homepage then navigated to tagged/facebook.
It will keep your initial selection when browsing elsewhere e.g. through each of the tags.