A brief summary of how user engagement is tracked on Tumblr, for the newcomer:
When you like or reblog a post, that counts as user engagement for the person you liked or reblogged from, and shows up in their notifications.
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If the person you liked or reblogged a post from wasnât the original poster (i.e., youâre liking or reblogging a reblog), it also counts as user engagement for the original poster, and shows up in their notifications as well.
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This means that user engagement from your likes and reblogs can potential accrue to two different people, the original poster and the person you liked or reblogged from.
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Consequently, you cannot âstealâ user engagement from someone by reblogging their post.
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This is one of the very few areas where Tumblr is actually functions more reasonably than other social media platforms.
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Note that this is only true if you use Tumblrâs built-in reblogging function. If you save someone elseâs content to your local device and append it to a new post, you effectively become the original poster from that point on.
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This means that on Tumblr, ârebloggingâ and ârepostingâ are two different things; if you see someone complaining about ârepostingâ, this is not the same as reblogging.
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Commenting when reblogging does not affect any of this â unlike, say, Twitter, where quote-retweeting causes user engagement to accrue to the quote-retweet and not to the original tweet â and you can and should do so freely.
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However, every Tumblr user can see who exactly you reblogged a post from, which functions as a soft disincentive against making inane comments; if you make a dumb comment on a reblog, people who see your reblog may âback upâ one step in the reblog chain to reblog a version of the post without your comment.
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Nobody understands tags, and thereâs a fair amount of evidence that how tags work changes periodically and without warning.
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Tags are a divine mystery.