According to the Reddit user MalteseAppleFan, Apple has deleted all content from its iTunes Facebook and Instagram pages including posts, photos, and videos ahead of WWDC 2019.
However, it looks like Apple has migrated its iTunes page to its Apple TV page on Facebook, including all the likes and its original post.
This happening with the rumors that iTunes app is to be discontinuing in the WWDC event.
Source: Macrumors