Ready to wave those Fourth of July flags? Before you do, get the skinny on Facebook's gigantic emotion experiment (which may have happened on your news feed). See how brands are jumping on World Cup action, say farewell to Orkut, and find out how to strengthen your content strategy... for whatever device your customer is using. Skim to stay in shape!

You run like a girl. Topping the viral charts is a charming number from Always, which explores what it means to do something "like a girl." You'll be moved, especially if you have girls at home—and it's way better than watching white pads soak up blue fluid. 18 million views don't lie, plus the hashtag #likeagirl is exploding with positivity on Twitter. (Unlike Robin Thicke's Twitter Q&A, which exploded in a different direction.)

Does Facebook make you sad? One possible reason: A study of 600,000 users that Facebook's scientists conducted to see whether News Feed content affects our feelings. Surprise! It does! They figured that out by feeding users posts with either more positive or more negative words, then checking their status updates the week after to see whether they were more positive or negative. Outside researchers condemned the 'Book for failing to get informed consent, and the study's editor called it an "open ethical question." (Facebook says it didn't have to ask, because all users agreed to its Terms of Service. For her part, Facebook No. 2 Sheryl Sandberg called the study "poorly communicated," adding that "we never meant to upset you.")

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image of Angela Natividad
Angela Natividad is a social media strategist, copywriter, and journalist based in Paris. A Bay Area native and lover of vending machine candies, she co-founded and is a frequent guest on marketing podcast The Beancast. You can follow her on Twitter at @luckthelady.