Almost everyone agrees that large swaths of Facebook, Twitter, Instagram, TikTok, and Reddit are terrible, each in their own way. But these monolithic social media platforms are so ubiquitous, it’s easy to forget that you don’t have to use them. Which isn’t to say that you have to swear off of social media forever: There are less odious alternatives that will still let you participate in online life.
These smaller, scrappier social media platforms aim to either correct the most egregious mistakes their big brothers and sisters make, or to provide niche experiences that the larger social media companies can’t/won’t.
I'd also add decentralised PixelFed as an alternative to Instagram, and for Twitter either WT.Social which is mentioned, or decentralised Mastodon. Key things about alternative social media is often zero adverts, no algorithms manipulating your feed, with you having better control over what and who you see.
See
The Least-Awful Social Media Sites for Anyone Who Wants to Be Less Unhappy#
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decentralisation 
There is no law that says you have to use Twitter.
