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Facebook Inc. (Nasdaq: FB) is working on tweaks to its news feed to prevent programs from blocking ads. Facebook is mostly insulated from the threat of ad blocking, though, as 84% of revenue in Q2 2016 came from mobile ads and mobile devices typically can't block ads. But Facebook still wants to make sure it is making as much revenue from ads as possible. FB stock is up 18.96% so far in 2016.