What you should be viewing on the Internet and on screen: Beyonce performs with ill fan; “Beyond Downton Abbey;” sharks on Twitter.

Screen time

In preparation for the American return of “Downton Abbey,” take a look at 20/20’s “Mysteries of the Castle: Beyond Downton Abbey” to see what inspired the Grantham homestead. … 9 p.m. EDT tonight, ABC.

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Love sharks? Now they’re on Twitter. More than 300 tagged sharks automatically send tweets when they swim within a kilometer of beaches on Australia’s dangerous west coast.

Hot video: Beyonce brings ill fan to tears

Beyonce made a dying girl's wish come true at a concert in Las Vegas earlier this month. Check out the video of their performance.

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