Which of these was used as a model service during the development of twitter

It was the "Odeo's business model".

Explanation:

It was back in the year  2006, when the general public got to know more about the social platform. As, it made headlines while going head to head with the Apple's launching of there own podcasting platform.

While, the developers then changed the whole business  structure or setup of the social application from the then"Odeo's business model". As they needed a more advance system to be more effective in nature.

if you suspect that your immediate supervisor, department manager, or company is engaging in something unlawful you must do your best to end the misconduct immediately while also protecting yourself, your livelihood, and your family’s future.

its tabs i just searched it up so try tabs