Direct message notifications. You now get a push when someone messages you, with a live unread badge on the Messages tab, and tapping the notification opens that conversation. Notifications can be turned off per conversation in Settings.

Also in this update:
- Historical satellite imagery loads faster and plays as a continuous timelapse
- Group chats are now limited to friends
- Place data from Wikimapia is served from our own snapshot, so it loads reliably again
- Fixes to sign-in, notification settings, and translations across all supported languages