I have so many duplicate constituents in my database because all RENXT compares when a gift from JustGiving comes in is the email address. It should compare the billing address to the physical mailing addresses to avoid the duplicated constituents. This is very very very frustrating and I hope will be implemented soon.
Not only does it create a ton of duplicates but I primarily work in the database view, and when I caught some duplicates - merged them without realizing that I then deleted all of the links to the JustGiving fundraising page in NXT! This is a real problem for me.
Yes, I am going through and cleaning up, manually, all the duplicates created by a recent campaign we did. Grrrrrrr