Final answer:
The most used platforms by "America's Got Talent" and the Huffington Post are, which have vast user bases and are significant for distributing content and engaging with audiences in the entertainment and media sectors.
Step-by-step explanation:
"America's Got Talent" and the Huffington Post are two entities that use digital platforms to reach audiences. The Internet as a digital space facilitates the flow of information and interaction through various social media platforms.
Platforms have millions of daily users and serve as popular mediums for both entertainment shows such as "America's Got Talent" to engage with viewers and news outlets like the Huffington Post to distribute content. While other platforms are also widely used, they cater to different demographics and serve distinct functions, from facilitating topic-based discussions to mostly social interactions.