It should be noted that the off-site metric for social media marketing is the number of followers on Twitter.
According to this question, we are to to discuss off-site metric for social media marketing and how this affect social marketing.
As a result if this we can see that off-site metric serves as any means of social marketing outside the site of that organization which makes followers on Twitter the right answer
Therefore, off-site metric for social media marketing is the number of followers on Twitter..
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