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I have a robots.txt file in the root to prevent search engines indexing any of my sites. I have a social media management application embedded on my site that includes all major social media channels including G+.

I heard that once the G+ symbol is on a site Google will index sites despite having a robots.txt in the root. Is this true?

My thought behind locking out robots for a while is so I increase visitors per day first before allowing robots to crawl. Once I e.g. reach 100 visitors a day I will remove robots.txt file and will then receive a better initial page rank (in mind that PR is only updated every couple of months). Is this reasonable? How much emphasize is placed on the factor %visitor increase/day?

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Remember to give Google ample time to add your G+ logo. Patience is a virtue! –  toughskin Nov 17 '13 at 12:43
    
Page rank is calculated on who links to you. It has nothing to do with amount or frequency of visitors. –  Max Nov 18 '13 at 2:13
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2 Answers

If you put a Google +1 button on your page, Googlebot will crawl the page even if the page is blocked by robots.txt. From the Google+ Webmaster FAQ:

Does +1 affect how Google crawls my site?

When you add the +1 button to a page, Google assumes that you want that page to be publicly available and visible in Google Search results. As a result, we may fetch and show that page even if it is disallowed in robots.txt.

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You appear to have many misconceptions about how search engines and ranking works, so I would suggest reading through the various Google help files. Google itself has an SEO starter guide. To answer some basic points:

  • PageRank is based purely on links to your site and nothing else.
  • If your site is new then Googlebot will not be visiting very often anyway, so there is no reason to block it.
  • The number of visitors to your site (or visitor increases) is not a ranking factor at all. Google cannot possibly know how many people are visiting your site besides the ones it sends directly.
  • robots.txt prevents crawling of a page, but the URL may appear in search results under certain conditions.
  • However as Stephen points out in his answer, Google may crawl URLs with Google+ buttons, even if they are blocked by robots.txt
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You have robots.txt backwards. It prevents crawling of your site but does not prevent indexing. –  Stephen Ostermiller Nov 18 '13 at 11:20
    
@Stephen yes you are correct, thanks. –  DisgruntledGoat Nov 18 '13 at 13:13
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