Mark Zuckerberg blocked Facebook's Like button for two years
Facebook's engineers had a working Like button ready by late 2007, but Mark Zuckerberg blocked it for two years while a smaller rival shipped one first.
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How a VPN works, and who still gets to watch you
A VPN encrypts your traffic and routes it through a company's server, so the question is which watcher you trust more, not whether one exists.
Certificate authorities check who owns a site before signing
Your browser trusts over 100 certificate authorities. CISA warns they vary in how strictly they check, and only a fingerprint check by phone is certain.
Instagram's Restrict cuts someone off without telling them
On Instagram, Restrict hides a person's comments from others and moves their messages to requests. They stop seeing when you are online and are never told.
Your IP address gives away your provider, not your street
An IP address identifies your device to every site you visit, and reveals your provider and a rough location, never an exact one.
Let's Encrypt made HTTPS certificates free and automatic
Let's Encrypt automated the forms, waiting and server setup as well, then issued its billionth HTTPS certificate in February 2020.
How to clear your cache in Chrome, Safari, Firefox and Edge
Clearing a cache slows one page load, but clearing cookies signs you out everywhere. Steps for four browsers, an iPhone, and one misbehaving app.
News sites test two headlines and keep the one you click
News sites show different headlines to small slices of readers and keep the winner. One word, epic, doubled clicks for The Dodo. Here is how it works.