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

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.

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