Dagger2 when to use it and when not

I'm working on a project and we use Dagger2. I wonder if it is advisable to use it in all our classes to avoid doing new when instantiating them. For what I am reading it is only necessary when the object instance is created in the constructor.

public class WeatherForecaster {

  private final LocationService locationService;

  public WeatherForecaster() {
    this.locationService = new LocationService();
  }
}

My question is using a class like this, for example:

public class SocialControler{

private ImageView twitterLogo;
private ImageView googleLogo;

public SocialControler(ImageView twitter, ImageView google){
twitterLogo = twitter;
googleLogo = google;
}
//Getters and Setters

}

When I instantiate the class in my Activity I have something like:

SocialControler mSocial = new SocialControler(mTwitterLogo, mGoogleLogo);

Is it necessary to inject the class SocialControler (that does not build any object in its constructor) in my Activity without making new by annotation @inject ?