When you moved in to a place that is new to you, it is given that you do not know anyone of your neighbors. It would be great to be friends with them if you find them welcoming you to the new neighborhood. However not too trusting at first, it would initially give you a warm feeling that your new place will be worth staying.
Looking on the other hand, if you are the one whose living on the neighborhood for a considerable time and some new neighbor has moved in, the neighborhood would normally be curious as to who the new movers were or where they came from and how they are as a neighbor.
Neighbors are the people we often get along with – unless we do not engage with them often for some reasons. In situations that you will be living with new people, having knowledge about them at certain level helps to know if they are safe people to live near with. Because of the closeness of your place, there will be cases that you will be affected with whatever activities they may have or do. If you have children, they will be playing with the neighborhood kids, they will be exposed to different people that you might have no idea about the backgrounds. This is important so that you will know who are the people that your kids are getting along with and the influences that they are giving your child. Aside from the above-stated concerns, there may have instances that you will have suspicious neighbors that may be bothering to you.
Most neighborhoods have homeowners association where you can first report your concern to. You may also search them up on your own through people search engines online that can give you ample information about the background of the person you want to know or verify your suspicions about.