What you need to know in advertising today

The World Series has been absolutely wild, and ratings - though down from last year's historic run for the Chicago Cubs - have been solid for Fox, even topping "Sunday Night Football," according to the Hollywood Reporter.

Besides attracting a large audience, the games have provided a text book example of why advertisers are still in love with TV, despite all of its flaws and challenges.

To read more about how The World Series and its ads shows why advertisers still love TV, click here.

In other news:

Venmo "killer" Zelle is rolling out new ads aimed at encouraging more people to ditch cash. The peer-to-peer mobile payment tool's biggest marketing push yet is to the tune of "double-digit multi-million dollars."

Jason Blum-backed Crypt TV thinks the next Freddy Krueger will be launched on mobile phones. The digital-media company is trying to build out a stable of horror franchises on Facebook.

Facebook now says 126 million Americans probably saw Russian posts that tried to sway US politics. That number is far higher than original estimates.

Netflix confirmed that "House of Cards" will end with season 6. The confirmation came a day after star Kevin Spacey was accused of sexual misconduct.

Slack, the $5 billion work chat startup, has hired Google exec Brian Elliott. He will spearhead an important expansion effort and help it keep a leg up amid growing competition from Microsoft and $10 billion Aussie software giant Atlassian.

Under Armour is plummeting after earnings. The company beat on earnings, but missed on revenue in its third-quarter report.

Papa John's sales reportedly drop amid national anthem protests - and the company is complaining to the NFL. The pizza chain and other top sponsors have brought up concerns with the NFL.

Advertising holding company WPP has revised down its guidance again for full-year organic net sales and its profit margin, Reuters reported. There are a number of factors at play, particularly consumer-packaged goods companies that are being forced to keep down costs by activist investors, which are squeezing agencies on fees.

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