Twitter isn’t having a great time. While Facebook continues to pile on the users and drag in the money, Twitter’s latest quarterly report showed a 0.5 percent decline in year-on-year revenue. User growth has stalled. Shares fell 10 percent on the news.

When Valerie Elmore saw a dog run out on a local road and get hit by a car, she did what anyone would do. She gathered the dog up and drove straight to a nearby animal hospital. Unfortunately, the dog died, and Elmore turned to Nextdoor, a local social network, to find out whether anyone had lost their pet.

PeepSo comes with a ton of features. We spent months building and testing add-ons that allow for video uploads and custom profiles, groups and moods.

And in the end it all comes down to selfies.

For about a month at the end of 2016, Transport for London – the body responsible for managing the London Underground, conducted an interesting experiment. It tracked the mobile phones of passengers traveling through the center of the city. Gizmodo has managed to acquire the data that TfL gathered — and it has some valuable lessons for managers of private social networks.

In general, networks like Facebook and Instagram are sharing platforms — they’re super broad. And when you’re posting about your passion, it’s irrelevant to many of your friends.

“Nobody in the office is crying,” Matthew Boyes told Techcrunch after the announcement that he had sold his UK company Streetlife to the American firm Nextdoor. The US-based local social network had closed a “multi-million pound acquisition” to buy its rival’s assets. None of Streetlife’s staff will follow the user data to the new owner as the American company attempts to penetrate the British market.

If your private social network caters to children, you’ve got some new competition. Lego, the plastic brick and caltrop manufacturer, has launched LegoLife, an app-based social network for iOS and Android devices.  And if your network doesn’t cater to children, you’ve got an example of the sort of thought that goes into adapting a private social network for a particular audience.

Facebook has recently announced a number of updates to Trending, a feature that shows topics currently popular on the platform. Users in the US, the UK, Canada, Australia and India have been able to see Facebook trends since 2014. On the Web, they appear in the top right corner, and on mobile, the trending topics can be seen from the search bar. The updates make three changes… and they mark an important move away from the personalization that has until now defined social networks.