If you are looking for the original tone or creative variations, these platforms are the best starting points:
While most phones come with a library of pre-installed sounds, many users prefer the familiarity of social media alerts. Customizing your device with a Facebook MP3 file allows you to: Distinguish your phone from others in a crowded room. Use the sound for video editing and content creation. Facebook Notification Sound Mp3 Download --BEST
He didn't expect much. But three hours later, the silence of his study was shattered. If you are looking for the original tone
Elias froze. He thought of his mother. Ding. He thought of his ex-girlfriend. Ding. He thought of the guy who sold him coffee. Ding. The Feed Facebook Notification Sound Mp3 Download --BEST
Zapsplat.com or Pixabay.com/sound-effects (both are legal/free for most uses)