The two correct assumptions the writer can safely make about the intended audience are:
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They have a basic knowledge of how social media works.
This assumption can be made because the audience has been using an older social media platform, which indicates they have experience navigating social media, understanding its functionalities, and engaging with online communities. -
They have no knowledge about the new social media platform.
Since the prompt specifies that the audience is transitioning to a new platform that just started this year, it is reasonable to conclude that they may not be familiar with its features, layout, or community yet.
The other options, such as the audience being mostly young people or in favor of the new social media platform, cannot be assumed without more information. Additionally, the audience's gender is likely diverse and cannot be generalized.