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Thank you for responses.But I don't think your answers meet my problem.In SERPS , my site ranks always changing at my keywords.Sometimes drops from first 500 , sometimes increases to 2 page.On other word , my site ranking highly changes every day.May my site got google over optimization penalty ? I did some social media sharing , bookmarking and forum promotion.(manuel)

I have forum site.I've opened it 2 months ago.But there is a problem.Therefore my content is unique , my site's keyword ranking constantly changing..Sometimes my site's ranking drops from first 500.After came to 70s.

I didn't make any off page seo to my site.What is the problem ?