Finding duplicates and avoiding creating more!
I love using the "Find Similar People" Tool, to find duplicates, rather than creating a new ID for someone born hundreds of years ago.
Also, by going into the history of "changes" to a person on FS--and looking for merged IDS--sometimes you can find that two people of the same name have been improperly merged together, when you unmerge them.
I wish that people would not simply load their "GEDCOM" files onto FS, creating new IDs, without documented sources. Very often they would find existing duplicates (instead of creating new IDs) if they would take the time to look.
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