FanFiction.Net's 2012 NC-17 Purge
A second wave of FanFiction.Net purges began in late May of 2012. This purge included stories rated MA (equivalent to NC-17), some stories rated M, as well as interactive stories, and stories that dealt with adult subject matter such as abuse or included curse words.
See also 
FanFiction.Net's 2002 NC-17 Purge
Read more
A notice clarifying FFN's content policy regarding MA rated fiction was posted to their front page on June 4, 2012. This caused much confusion on behalf of the user base as to what content should be classified M or MA and for what reason. Users speculate that this purge was caused by a policy change around the same time that would allow users under the age of 18 to register, as first mentioned in 2002.
As with the previous purge, several petitions were created in protest with no success. Another mass exodus was also made, now to Archive of Our Own (Ao3), which was still in its infancy having been launched in 2009 in response to the 2007 LiveJournal Strikethrough and Boldthrough.
Though the exact number of stories that were lost is unclear, it is estimated that anywhere between 8,000 and 62,000 stories were deleted, and thousands of accounts were suspended.
