Today, we break down the phenomenon of social media activism, investigate Facebook's user experiment, ponder NVIDIA's next Shield console and get excited about the reboot of Chumby's smart alarm. Read on for Engadget's news highlights from the last 24 hours.

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What you need to know about social media activism

What do the "OccupyWallStreet" and "CancelColbert" hashtags have in common? They're both examples of what's been termed "social media activism." Read on as Ben Gilbert dissects this modern form of protest and what it means to you.

Facebook used you like a lab rat and you probably don't care

Smiles are contagious. So are depressing Facebook posts, apparently. In 2012, Zuckerberg and Co. manipulated its users' happiness (gasp) by secretly bombarding their news feeds with waves of positive and negative stories.

Chumby's smart alarm clock relaunches with 1,000 apps

Good news Chumby owners, the tiny smart alarm's network is back online and better than ever. What's more, the company's reboot includes 1,000 apps and a more efficient Chumby performance.

NVIDIA's Shield successor is a tablet

NVIDIA's next Shield console might not be a "console" at all. According to a listing from the Global Certification Forum, the gaming company mistakenly leaked information about an upcoming "Shield Tablet," including some specs.