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.
Social Media Image Sizes: Documented, or Just Widely Agreed?
Every size guide gives you a table. This one marks which figures the platforms actually publish and which the internet simply agreed on — a distinction that decides how much to trust each number.
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There Is No Best Time to Post on Reddit, Because Reddit Is Not One Place
For once the guides agree — 6 to 9am Eastern on weekdays. Every one of them also adds that it depends on the subreddit, and that caveat is the answer rather than a footnote.
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The Best Time to Post on X: Where Timing Finally Matters
X is the exception in this series — posts have the shortest working life anywhere, so the hour genuinely counts. Which makes it worse that one ranking page contradicts itself and another is dated 2015.
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The Best Time to Post on Pinterest Is a Season, Not an Hour
One guide ranking for this question recommends 2am to 4am. Understanding why that figure exists explains the entire genre — and Pinterest is a search engine where the hour barely matters anyway.
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The Best Time to Post on Threads Is Suspiciously Familiar
One company's blog says Thursday 9am while its own Threads post says Wednesday 7am. The same company reports that four different platforms peak at exactly the same hour.
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The Best Time to Post on YouTube Matters Least of All
Buffer's single dataset gives Sunday 10am for long-form and Friday afternoon for Shorts. And on a platform where videos earn views for years, the upload hour is a rounding error.
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