This post tests various embed blocks:

https://twitter.com/WordPress/status/1057136472321613824
Twitter,  wide width
YouTube
https://www.facebook.com/6427302910/posts/10156380423617911/
https://www.instagram.com/p/BpmueLLgEn_/?utm_source=ig_share_sheet&igshid=1hcxphic7p9e2
WordPress TV, full width