My site practically disappears from google search results. I was not doing any SEO practice or suspect activity. Lately there any upgrade or changes in google that could cause this? I don´t know what to do.... any idea?any advice?
Start by checking Google Webmaster Tools for any problems with your site. Then do a thorough analysis of your pages and backlinks. Things like this usually happen for a reason. Google is constantly tweaking their algorithm with minor updates and periodic medium sized updates. There is also a chance that your website was somehow flagged for a manual review. Do you not even show up for your domain name?
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If there is high competition between keywords that you have used for your website then this may be the reason that your website's visibility is fluctuating in Search engine's results. If your site is getting back on Google then it is a good news. But make sure about your keywords, so that you would not get any problem in future.
Remove duplicate content, bad links, broken links, paid links, advertising from your site. Rearrange with good unique (copyscape pass) content (huge text, less image). Then submit to google & bing webmaster manually. Hope you will reach your target.
Google has frequently changed their algorithm. By this cause your PR fell down. So i would like to advice you that do seo by an organic way.