When you use an application, the application may ask for your permission to access your content and information as well as content and information that others have shared with you. We require applications to respect your privacy, and your agreement with that application will control how the application can use, store, and transfer that content and information. (To learn more about Platform, including how you can control what information other people may share with applications, read our Data Policy and Platform Page.)
You gave access to your friends, who then authorised access to the application.
Failing to honor that assumption is facebooks fault here.
Actually, that is how it works. Unless there is an NDA in place between you and I, I can share anything you choose to share with me, especially in the context of a social network where we both agreed to and are bound by the same TOS where we authorized exactly this kind of sharing.
Readability Grade Levels
A grade level (based on the USA education system) is equivalent to the number of years of education a person has had. A score of around 10-12 is roughly the reading level on completion of high school. Text to be read by the general public should aim for a grade level of around 8.
Flesch-Kincaid Grade Level 12.6
Gunning Fog Index 13.9
Coleman-Liau Index 11.8
SMOG Index 14.9
Automated Readability Index 12.4
Average Grade Level 13.1
Text Quality: Sentences > 30 Syllables 80 53%
Sentences > 20 Syllables 115 77%
Words > 4 Syllables 37 1%
Words > 12 Letters 2 0%
Passive Voice Count 17 1%
Adverb Count 116 4%
Cliché Count 0 0%