CNNMoney's most social stories of 2015

iPhone 6S: Cost to build
iPhone 6S: Cost to build

1. Apple sued over iOS8 taking up too much storage space

A group of Miami iPhone customers sued Apple in January, accusing Apple of misleading them about the amount of space on their iPhones -- they don't really have 16 GB of storage space, since some of that space is taken up by Apple's iOS software.

It was the most-viewed story CNNMoney on Facebook in 2015.

The court battle continues. Apple filed several motions to dismiss the case that the court is currently considering.

2. Starbucks offers free college tuition to its employees

Starbucks announced in April that it would cover employees' full tuition to Arizona State University's online program, giving them the chance to earn a bachelor's degree for free.

Last week, Starbucks provided an update about the program's progress, highlighting three employees who took advantage of the free tuition. They otherwise would not have been able to afford a degree.

starbucks baristas

3. American Sniper becomes the highest-grossing war movie in U.S.

In February, "American Sniper" passed "Saving Private Ryan" as America's highest-grossing war movie.

That is, of course, unless you count the war between the galactic empire and the rebel alliance. "Star Wars: The Force Awakens" had the highest-grossing opening weekend for any movie ever earlier this month.

sniper ryan

4. Mark Zuckerberg gives $5 million to undocumented immigrant college fund

Mark Zuckerberg said in June he would donate $5 million to a national scholarship fund for undocumented immigrants -- the day after Donald Trump went on a tirade about immigration while announcing his candidacy for president.

Last month, Zuckerberg announced the birth of his daughter, Max. He and his wife, Priscilla Chan, committed to give away 99% of their money over the course of their lifetimes.

mark zuckerberg priscilla chan

5. Elizabeth Warren says she will continue to call for big Wall Street banks to be broken up

Senator Elizabeth Warren said in March that she was a "serious threat" to Wall Street.

Warren has remained out of the limelight of presidential politics but the presence of her populist agenda has been felt during the race. During Hillary Clinton's announcement of her campaign, CNNMoney's Tami Luhby wrote, "If you close your eyes, you might think Elizabeth Warren is talking."

Elizabeth Warren

--CNNMoney's David Goldman and Aurelio Kim contributed to this report.

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