Sometimes vandals insert a piece non-sensical information in the middle of a big article which stays covert for years. This is specially true in the Portuguese Wikipedia, which doesn't have enough task force for a immediate vandalism response. It would be great if there was a tool to "blame" a paragraph, like there is in GitHub. I mean, a tool that, given a paragraph (or a set of paragraphs), points out the last edition (or, perhaps, all the editions) in which this paragraph showed up in the differential. Sometimes it wouldn't work due to merges and displacements, but probably would for the 99%.

--Usien6 (talk) 03:06, 11 November 2015 (UTC)

This card tracks a proposal from the 2015 Community Wishlist Survey: https://meta.wikimedia.org/wiki/2015_Community_Wishlist_Survey

This proposal received 15 support votes, and was ranked #53 out of 107 proposals. https://meta.wikimedia.org/wiki/2015_Community_Wishlist_Survey/Moderation_and_admin_tools#Paragraph_blaming_tool