(Source: www.wsj.com)

The ​group video chat app Houseparty is​​ gaining traction ​among teens and young adults. ​We asked some users to explain it all — to their parents. Photo/Video: Heather Seidel/The Wall Street Journal

Tech startups live by the rule that speed is paramount. Houseparty, creator of a hot video app, has an extra reason for urgency.

Facebook Inc., a dominant force in Silicon Valley, is stalking the company, part of the social network’s aggressive mimicking of smaller rivals. Facebook is being aided by an internal “early bird” warning system that identifies potential threats, according to people familiar with the technology.

More Info: www.wsj.com

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