Instagram has a drug problem. Its algorithms make it worse.

Instagram is known for its celebrity posts and photos of enviable vacations. But it has also become a sizable open marketplace for advertising illegal drugs.The company has pledged a crackdown in recent weeks, but it is struggling to keep pace with its own algorithms and systems, which serve up an array of personalized drug-related content aimed directly at people who show an interest in buying substances illicitly.Recent searches on Instagram, which is owned by Facebook, for hashtags of the nam