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The terms and conditions of Twitter state that it is the creator of the content as well as the person who publishes it that owns the copyright

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I feel like the picture itself depends on who took it. For example, if I took a picture of my cat, Eli, then I would have the copyright of the picture. If I took something from the internet, then it would go to the original source post. However, the post would be credited to me yet insta has access to use your content.

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I feel like the picture itself depends on who took it. For example, if I took a picture of my cat, Eli, then I would have the copyright of the picture. If I took something from the internet, then it would go to the original source post. However, the post would be credited to me yet insta has access to use your content.

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On Instagram, you own your own picture but, you give instagram a non exclusive, royalty free right to use the content .

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Twitter's "Terms of Service" outlines all policies with regards to users' tweets. Users hold all rights to the content or tweets they upload to the platform. To avoid any copyright infringement, Twitter users would need consent (i.e. a license, another form of permission, etc.) from a copyright owner.

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On twitter accounts own the posts that they create. Users own their tweets. Twitter’s appeal argues that users have a property right to the content they post and have a Fourth Amendment privacy right to their accounts. The company says that deleted Tweets are not public, and that Twitter accounts should have the same protection as personal email accounts

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The person who posted the video retains all of the rights to the video. 

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The person who posted the video retains all of the rights to the video. 

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By signing the terms and agreements the creator does grant YouTube a worldwide not exclusive, royalty free, subliscenceable and transferable license to use, reproduce, distribute, prepare derivative works of, display and perform.
You also grant others the right to use your work.

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The owner owns copyright of their work but Reddit has the right to do whatever they want with the owner’s content.

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Youtube has an agreement that users must sign that says that anything uploaded by creators is automatically the property of YouTube and can be used by other users as well

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According to Twitter's Terms of Services, a twitter account that posts original content (text, image, or video) outright owns the copyright to those posts. Twitter uses can post the works of others (text, image, or video), provided that they source the original creator/owner of the copyright.