Have you searched for something lately and ended up reading a Facebook Notes post?
Yeah, me neither.
I gave Google a week to find my public note on facebook:
But it is really there:
Guess what? No search engine other than Facebook itself can know about that post, because as soon as e.g. Google hits https://facebook.com/roman.yepishev it sees this:
There is no entry point to Facebook Notes. Will there be one? Maybe... No. Look at Facebook's robots.txt - it does not really want the search engines to look inside, but it does not mind if you end up with a direct link.
... User-agent: Googlebot Disallow: /ajax/ Disallow: /album.php Disallow: /checkpoint/ Disallow: /contact_importer/ Disallow: /feeds/ Disallow: /file_download.php Disallow: /hashtag/ Disallow: /l.php Disallow: /live/ Disallow: /p.php Disallow: /photo.php Disallow: /photos.php Disallow: /sharer/ Disallow: /topic/ ... User-agent: * Disallow: /
So how can people read the notes?
There are two ways - they are either already browsing Facebook, and somebody on Facebook shared the note to their friends (less likely - they specifically search for the text in the note). Or, alternatively, if somebody outside of Facebook posted a direct link to the page.
But it does not have to be that way. You can find the only reference to my unique post hosted here from the sitemap.xml generated by the blog engine directly. And Google found it. Google is awesome at finding things: