From Katherine Zoepf, writing in The Lede:

For most young Saudi men, a night of numbering is simply a night driving around with friends, listening to music, chasing cars containing black-draped figures that could just as easily be old women as young girls. Since numbering is considered harassment, detention by the religious police is an ever-present possibility.

We turned onto Thalia Street, a prime spot for numbering because of its many restaurants.

“There! There in the GMC!” Mohamed shouted. “Girls!”

Through the tinted windows in the back of the GMC, I could make out three indistinct black shapes. Thamer stepped on the gas, but a white Mercedes S-class containing four young Saudi men edged him out. The Mercedes pulled alongside the GMC, and the two young men in the back seat waved pieces of cardboard with phone numbers written on them.

“They beat us,” Fahad complained, as Thamer tried to pull up behind the GMC. “And they have a hotter car.”

I looked around. We were surrounded by several other cars, all containing young men and all trying to get the attention of the figures in the GMC, while simultaneously trying to edge each other off the road at high speed.

“Isn’t this getting a bit dangerous?” I asked.

“Yeah,” said Fahad. “Sometimes the girls get really scared, there are so many cars chasing them. Sometimes they’re in their car, crying and screaming for us to go away. It’s fun to make girls angry.”

A phone number written out on a piece of cardboard is “the classic approach,” Fahad said, but most of the time he and his friends use Bluetooth to try to send their phone numbers directly to the cell phones of girls in the vicinity.

Full post is here. She also reports on the lives of young women and has a Q&A on love and romance in the Kingdom.