Do we need to post unique content on every Social media website?
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Can we use the same content (description) for FB, Twitter, Pinterest, Google+ etc?
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I´m doing it and my blog is going quite well

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Hi Howard,
As for the 'have to', I'd say no, you don't really have to use unique descriptions with your content on those networks. But I'd keep in mind that your audience is on several of those networks because they want to find different kinds of content or want to engage in a different way. Thus by copying descriptions and make something potentially unique generic, you might miss a good opportunity to connect with your audience on one or more of those networks.
Just my 2 cents, hope this helps you

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Ive been using the same content with all the social media sites. Never thought about it.
I guess that what Bas is saying is reasonable: you can engage with the followers offering different content in different social sites.
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Bas is 100% right, you do not have to but each social media outlet's audience act differently. To get the most out of your social media postings you should tailor your message delivery and content based on each platforms strengths and what your customers respond best to on each independently.
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"Let's put this to bed once and for all, folks: There's no such thing as a "duplicate content penalty." At least, not in the way most people mean when they say that."
"Duplicate content on a site is not grounds for action on that site unless it appears that the intent of the duplicate content is to be deceptive and manipulate search engine results. If your site suffers from duplicate content issues, and you don't follow the advice listed above, we do a good job of choosing a version of the content to show in our search results."
This information is from Susan Moskwa, Google Webmaster Trends Analyst.
The only problem with duplicate content is that Google has to decide which copy should rank highest.