The popular app can feed young users a stream of intense, polarized and hard-to-verify videos about the Israel-Hamas war.

A documentary revealing how the Russian private military company hides the flow of riches and resources that ultimately connect to the Kremlin.

A web of shell companies and middlemen managed by services firm Bridgewaters makes it hard for authorities to track assets and enforce sanctions against blacklisted oligarchs.

The final installment of a WSJ podcast series examining how difficult it is for TikTok users to disengage from harmful content, and what responsibility parents, governments, and TikTok itself bear in keeping the platform safe.

A WSJ podcast exploring how TikTok's algorithm struggles to distinguish helpful from harmful mental health content, and how recovery videos can inadvertently send other users into spirals.

A WSJ podcast investigating how TikTok's algorithm can funnel users into streams of potentially harmful content about starvation diets, self-harm, and suicide, even when they didn't seek it out.

TikTok's algorithm can send users down rabbit holes of narrow interest, surfacing emaciated images, purging techniques, hazardous diets and body shaming.

The popular app can quickly drive young users into endless spools of adult content, including videos touting drug use and promoting pornography sites.

The Wall Street Journal created dozens of automated accounts that watched hundreds of thousands of TikTok videos to reveal how the platform's algorithm learns users' interests.

Months before travel bans and lockdowns, Americans were transmitting the coronavirus across the country.

The Cloud Hopper attack was much bigger than previously known.

A reconstruction of the worst known hack into the nation's power system reveals attacks on hundreds of small contractors.

An analysis of 221,641 tweets shows Russian trolls tried to incite chaos, fear and outrage about fake events before their election activity.

VEB, a Russian state-run bank under scrutiny by U.S. investigators, financed a deal involving Donald Trump's onetime partner in a Toronto hotel tower.

A 2009 Land Cruiser followed the same overseas car caravan that U.S. officials alleged raised millions of dollars for Hezbollah.

The firm that touts the Butterball turkey is being investigated over alleged ties to designated terrorist entities.

Banks close the accounts of customers they fear may be up to no good, evicting from the financial system those the government most wants to watch.

More than 550 police killings between 2007 and 2012 were missing from the FBI's records.

More than 2,300 providers earned $500,000 or more from Medicare in 2012 from a single procedure or service.

More than 5,000 brokers were still licensed to sell securities after working for firms that regulators expelled.

An investigation found many corporate executives make profitable trades prior to news announcements.

More civilians are killing each other and claiming self-defense, a trend most pronounced in states with stand-your-ground laws.

Analysis of nearly 100,000 voting precincts revealed potential vote-rigging with up to 14 million votes in question.