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The most important for me is to check mentions about our brand, where they are coming from, but I also use it to check other brands.
Brand24 helps me to find two websites where someone created an account about my brand, which I didn't know about, and thanks for these results I could make some steps.
PDF reports and Comparison (but here would be nice to add reach).
When I am using Brand I'm mostly checking main page where I can find those mentions and websites.