There's a key difference there: the practices described in the jungle directly affected the population at large, by way of the food they ate. The kind of exposé in tfa requires the masses to have collective empathy.
While "Mary had a little lamb" may be the part everyone remembers - and is THE REASON why the FDA was founded - the book spends more time discussing exploiting labor (unions and busting them); the role of banks in predatory housing; the role of transportation networks in segregation; and all kinds of issues related to immigration, education, and public health.
The population at large is heavily affected by Facebook as well.