The facts that help you know that something is true are often referred to as evidence.
If you make a claim, you have to back it up with evidence.
Regarding the article "Reality check: life behind Insta-glam image of 'influencers'", here are responses to your questions:
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One piece of evidence that proves the way influencers portray themselves on social media is more glamorous than they are in real life: Influencers often use filters and post-edited images to enhance their appearance and create an idealized version of their lives, which can mislead their audience about their actual lifestyle and experiences.
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One piece of evidence that proves that being a social media influencer is a lot of hard work: Many influencers spend significant hours planning, creating content, engaging with followers, and keeping up with trends, which involves a constant effort to maintain their relevance and popularity.
(Note: Since I don't have access to external articles, the specific examples provided are general assumptions based on common knowledge about social media influencers. Please refer to the article for exact details.)