From the Cambridge Police Department, Dec. 4, 2015: The Cambridge Police Department will announce on Monday a collaboration with Nextdoor, a private social network for neighborhoods, to improve citywide and neighbor-to-neighbor communications.

The collaboration will enable the police to build stronger, safer communities with the help of Cambridge residents. Police and Nextdoor neighborhoods will be able to communicate and work together to increase safety and strengthen virtual neighborhood watch.

At the meeting will be Police Commissioner Robert C. Haas and police command staff; Joseph Porcelli, the senior city strategist for Nextdoor; and Cambridge Nextdoor members. Already 28 neighborhoods representing 97 percent of the neighborhoods in Cambridge have started Nextdoor websites.

The community meeting to introduce Nextdoor is at 6:30 p.m. Dec. 7 in the first-floor community room of the Cambridge Police Department’s Robert W. Healy Public Safety Facility, 125 6th St., East Cambridge, near Kendall Square.