Good morning! This is the tech news you need to know this Monday.Tech firms scrambled to keep dozens of copies of videos showing the New Zealand mosque shooting off their platforms. YouTube, Facebook, and Twitter struggled to stop users ripping and uploading copies of the original video, and the distressing footage was easily discoverable the day after the incident.Facebook, facing huge criticism over live streaming, says it removed 1.5 million videos of the New Zealand shooting in 24 hours. The social network came under major pressure after New Zealand shooter Brenton Tarrant livestreamed himself carrying out the attack.Lyft will seek a valuation of up to $23 billion when it goes public next week, according to the Wall Street Journal. The firm plans to raise around $2 billion during its initial public offering.The academic at the heart of the Cambridge Analytica privacy scandal is suing Facebook for defamation. Kogan alleged that Facebook defamed him when it said he lied about how the data collected by the app would be used.Andreessen Horowitz investor and Facebook board member Marc Andreessen has denied claims he met the Cambridge Analytica whistleblower Chris Wylie in 2016. The Observer reported that Andreessen hosted a meeting to determine how Cambridge Analytica might be misusing people's data - but Andreessen denied ever meeting Wylie.Women running for the Open Source Initiative board of directors have been harassed online, they told Business Insider. Open source communities, where programmers voluntarily build freely available software together, has been a famously hostile area of the tech industry towards women and other unrepresented people.Spotify described Apple as a "monopolist" as it rounded on the iPhone maker again over the pair's App Store spat. After Apple contested Spotify's antitrust filing to the EU, Spotify told Variety: "Every monopolist will suggest they have done nothing wrong and will argue that they have the best interests of competitors and consumers at heart."New research shows just how smart Facebook was to keep Instagram's brand separate. A survey commissioned by Business Insider shows Instagram is the app of choice for Gen Z, who have otherwise abandoned Facebook both for privacy reasons and because it's "boring."Facebook is to lose its chief product officer, Chris Cox, and there's a major red flag in his goodbye letter. A telling line suggests there were significant disagreements over Mark Zuckerberg's plan to pivot Facebook to privacy.Google+ may be dying, but the content will live on thanks to the Internet Archive. The digital library is working to preserve all public Google+ posts before the ill-fated service shuts down next month.Have an Amazon Alexa device' Now you can hear 10 Things in Tech each morning. Just search for "Business Insider" in your Alexa's flash briefing settings.Join the conversation about this storyNOW WATCH: The wives of high-level cocaine traffickers reveal how their husbands took down 'El Chapo Click here to read full news..