The file robots.txt doesn’t exclude all the search engines to crawl your site… Most search engines crawl the hole site without taking the robots.txt file in consideration.
I think that the best way is to use meta tags in the theme of the blogs.
Use the next meta tags for post and categories template files:
<meta name="robots" content="index, follow" />
<meta name="googlebot" content="index, follow" />
Use this meta tags for the rest of the template files
<meta name="robots" content="noindex, nofollow, noarchive" />
<meta name="googlebot" content="noindex, nofollow, noarchive" />
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