Social network website effect on google ranks

[ankitnagpal]

Hi,
Please can anyone tell me if the content posted on social network websites like facebook, myspace etc. has an impact on google ranking specifically. Social sites give direct traffic for sure and most of these social network sites allow clickable hyperlink and not anchor tags. so will these be better than article, pr and blog submissions? or is it anyway useful to do social media marketing if only done for google ranking purposes? because I am targeting only google ranking optimization.

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Thanks,
Ankit

[socialbookmark]

Every quality backlink which can be crawled and indexed by search engines is useful for ranking better in search engines. So if you get a backlink from a social network website that the pages of it can be indexed by Google, it can help you. But if Google doesn't index pages, it doesn't help your ranking but probably it can drive traffic for your site.