There's also a thing (perhaps you might recall) that started, I want to say, back between 2006-2008 when Digg, the link-sharing website, was sort of reaching peak link-sharing. At the same time blog CMSs were just getting the "automated re-posting" thing together so you could basically push a button and republish someone's post or a blurb from it and the link to it (but either implementation would post on their blog as your post's title for the title and your post's content for the content, or your post's title for the title and a link and blurb if it was cut more RSS-style).
The problem with that, as I recall, was bad actors on the intertubes would set up reposting blogs solely to repost your/other people's post(s) (sometimes working in collusion with each other; other times, acting as lone wolves) - which, if you had good search engine rankings to begin with, could sink those rankings pretty fast (for, in Google's eyes, having "bad-quality" backlinks), but not before sometimes building up their own rankings at your expense by linking to a higher quality blog (say, yours) than their own.
I've actually watched a few of my posts/entire blogs go that way in Google for exactly this reason.
There was eventually such an uproar that in many circles it became just not done to re-post, even if you weren't spamming or trying to game SEO, and I think Google eventually adjusted their SERPs to account for (and bury) most of these sorts of spammers, but the damage was long done for a lot of people's blogs by then.
Just another reason reposting eventually fell out of favor but...that said, if it's done right (more RSS-style - blurb/link) by non-spammers/non-search engine gamers, I'd think it might help rankings the same as any good quality backlink would, not to mention having the ability to do it on a site where your friends or online crew hangs out can help bring your posts before more eyes, which is good if that's what you're after.
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The problem with that, as I recall, was bad actors on the intertubes would set up reposting blogs solely to repost your/other people's post(s) (sometimes working in collusion with each other; other times, acting as lone wolves) - which, if you had good search engine rankings to begin with, could sink those rankings pretty fast (for, in Google's eyes, having "bad-quality" backlinks), but not before sometimes building up their own rankings at your expense by linking to a higher quality blog (say, yours) than their own.
I've actually watched a few of my posts/entire blogs go that way in Google for exactly this reason.
There was eventually such an uproar that in many circles it became just not done to re-post, even if you weren't spamming or trying to game SEO, and I think Google eventually adjusted their SERPs to account for (and bury) most of these sorts of spammers, but the damage was long done for a lot of people's blogs by then.
Just another reason reposting eventually fell out of favor but...that said, if it's done right (more RSS-style - blurb/link) by non-spammers/non-search engine gamers, I'd think it might help rankings the same as any good quality backlink would, not to mention having the ability to do it on a site where your friends or online crew hangs out can help bring your posts before more eyes, which is good if that's what you're after.