I have set up my daughter's profile on the Deco app, added her tablet and set as Child 0-7 years.
(as per this guide:  https://www.tp-link.com/uk/support/faq/1598/ ).

She is still a bit young to be doing anything on the internet by herself, but I just wanted to test the function, so I know how it works in the future.

So just to test it I visited Twitter and Facebook, which are still accessible from the browser.
Social media is one of the things that is supposed to be blocked. So why are these still coming up?

Even if you manually add the full URL for Twitter (for example) to blocked content, it can still be accessed.

(Instagram however does seem to be blocked)