I'm actually doing that currently. We have a large database of company records compiled from different sources. Naturally, some of those records are duplicates. We have cleaned the data as much as it was possible using algorithmic approaches, but that only gets you so far. To go the last mile, we added widgets to the pages showing similar records where users may click "same company" or "other company". Poll results are aggregated and values above a certain threshold create an entry in a verification queue for our staff to look at. This works out surprisingly well for now.