I would like to know if a site created in multiply.com with a link to a website is counted as back links by search engines?
A link is a link is a link.
However, a link on a page with more than 30 links is not very good at all.
A link on a page that has nothing about what you do is not that good.
Most authority sites have no follows these days as well. Not a bad thing as it still shows up, but it will keep you from getting crawled from site to site.

Absolutely, any website that has a links will automatically draft a backlink.visit to this website for more information.
References :
http://www.seospan.com/
A link is a link is a link.
However, a link on a page with more than 30 links is not very good at all.
A link on a page that has nothing about what you do is not that good.
Most authority sites have no follows these days as well. Not a bad thing as it still shows up, but it will keep you from getting crawled from site to site.
References :
http://www.kortia.com/link-exchange.html
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