For Marissa, continued from Jan. 13—

"Killer App" —

By David Barboza in today's print NY Times.
Stephanie Yifan Yang contributed research.

A version of this article appears in print on January 21, 2014,
on page B1 of the New York edition with the headline:
A Popular Chinese Social Networking App Blazes Its Own Path.

Another path —

See also Chinese Oracle.