What are the Spam Refferals?

Hi friends I am constantly seeing these site in my Google Analytic. I have not put links on these site why I am getting referrals from these sites. Are these referrals harmful form my site? Here are the sites:

• site4.free-floating-buttons.com / referral
• get-free-social-traffic.com / referral
• floating-share-buttons.com / referral

from Google Analytics http://ift.tt/1K9fIvW
via IFTTT

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