Whether it's Facebook, Instagram, Twitter, or Snapchat, lock down who can see what you're up to.

Take a look at how 10 companies use Twitter's unique features to reach and engage new and existing audiences.

Our lives and habits are being tracked. Every time we tap in a Google search, every time we click “Like” on Facebook and every time we make an Amazon purchase, we are giving away information about ourselves: our thoughts, our preferences, our behaviors.

Facebook no longer ranks among the world's 10 most valuable brands, according to branding consultancy Interbrand, a sign the repeated blows to the social media company's reputation in recent years is taking a toll. Facebook fell to No. 14 in Interbrand's annual ranking of "best global brands," released this week. Just two years ago, the company was No. 8 on the list and was singled out as a "rapidly appreciating" brand.

In a phone call to the self-described cancer researcher Amanda Jewell, a British woman who calls herself "Mary" describes how she is struggling to cope. "My mother, she has stage three breast cancer. It's spread to her right. It's spread to her lymph nodes and they're giving her chemotherapy. It's so distressing," she says.

In case it wasn't clear already, Mark Zuckerberg really isn't a fan of TikTok. During a speech at Georgetown University, the Facebook CEO had some forceful criticism for rival app TikTok, which is owned by Chinese company ByteDance. "While our services, like WhatsApp, are used by protesters and activists everywhere due to strong encryption and privacy protections, on TikTok, the Chinese app growing quickly around the world, mentions of these protests are censored, even in the U.S.," Zuckerberg said. "Is that the internet we want?"

Cool policies. You ever going to enforce them?

Zuckerberg’s speech feels like empty words in the absence of any concrete changes to the company’s questionable policies on speech.

Federal authorities served search warrants to social network and white supremacist haven Gab as well as Twitter in an investigation into a neo-Nazi arrested for child pornography in Boulder, Colorado.

Welcome new subscribers! Today we celebrate The Interface’s second birthday. For two years now, we’ve done our best to bring you the day’s most important developments in technology and democracy. The next year, which will bring us a US presidential election, promises to be the most consequential yet. Thank you for reading it and sharing with your friends and coworkers. And if you’re in San Francisco and would like to meet us in person, there are still some tickets available for our first-ever live event on Tuesday, October 22nd: my conversation with the brilliant disinformation researcher Renee DiResta. I hope to see you there!

Facebook CEO Mark Zuckerberg briefly poked his head out of his gilded panic room on Monday to address reports that he ran a quiet lobbying campaign to reassure right-wing critics of his company that he shares their concerns. In his view, he’s guilty of nothing more than “hearing from a range of viewpoints” and “learning.”

Once you do some simple math, you learn that it's completely doable to read 200 books in a year.

Except... it turns out that the latter part of Warren's "fake news ad" -- the part which she presents as truthful -- is actually false as well.

Facebook's News Tab reportedly won't have ads, but it will have some human-curated Top News headlines.

The father of an autistic girl said he was "blown away" when strangers responded to a desperate plea to help his daughter celebrate her birthday. Remi was so upset when only two children turned up for her fifth birthday party that she asked her mother "where are all my friends?"

"Just because it's not the state doesn't mean that there isn't harmful impacts that could come if you have one or two large companies monitoring or tracking everything you do," says Christopher Wylie.

Twitter used phone numbers provided for two-factor authentication to target ads—just like Facebook did before.

President Donald Trump has joined the Amazon-owned video game streaming service Twitch as part of his 2020 re-election campaign. But Trump has well-known long-standing animosity with Amazon and its founder Jeff Bezos and has railed against violent video games in the past.

Millions of Flickr images were sucked into a database called MegaFace. Now some of those faces may have the ability to sue.

Five payments companies led by eBay, Mastercard and Visa have abruptly dropped out of Facebook's project to create a new digital currency, Libra, dealing a major blow to the social network's plan.