Premium Data Sources provide even more mention insights. You can find them within Project Settings > Sources.
Collecting all mentions is a complex and expensive job. We crawl the web, use multiple data providers and APIs to aggregate mentions. By doing this, we're able to provide one of the most comprehensive dataset of mentions available online.
On the Company and Enterprise subscriptions we provide even more data. We include a set of premium data providers that are highly expensive. This provides you with an even larger dataset of mentions.