The Social Magnum blog
Notes from building on all social networks — the platform rules, the publishing playbooks and the API behaviour nobody documents. Every figure here was checked on a live account.
Instagram Profile Picture Size: Nobody Publishes One
Page one offers five different figures and one of them is the Reel cover size, offered by a resizer as a profile preset. Instagram itself publishes no dimension at all, which is why they have drifted so far apart.
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How to Schedule LinkedIn Posts, and the Three Limits
LinkedIn schedules posts free and its own help page ranks first, so the steps are easy. The window, the three post types it refuses, and the time zone rule are not.
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LinkedIn Post Size: The Number Everyone Quotes Is the Link Card
LinkedIn publishes 1200 x 627 and says in the same breath that it does not apply to image posts. It also says it will not crop your feed image at all, which undoes the premise of every guide on this subject.
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Best Time to Post on LinkedIn: Ten Hours of Disagreement
LinkedIn ranks twice on page one for this question and its two answers contradict each other. The largest study on the page, 4.8 million posts, disagrees with the consensus as well.
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How to Schedule Twitter Posts Without Paying for Anything
X schedules posts natively from the compose box, for nothing. The result ranking first for this question is X's advertising documentation describing a different product entirely.
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TikTok Video Size: The Length Limit Is Not Fixed
Every guide gives one maximum length. TikTok's own API returns a different one per account and says so in writing, which means no single published figure can be right for everyone.
Read the articleWe write this down because we hit it ourselves.
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