In the candidate database (link) you can, among other filters, also filter by the source of the candidate or their response to a specific position.
The source from which the candidate responded, or from which you sourced them, can be combined with other filters within the database and can give you very valuable information in a few clicks, or make it easier for you to process candidates across positions and within one position, evaluate cooperation with agencies, etc.
This filtering will help you not only quickly find out the number of candidates from a certain source, but also for example with tasks like "I need to process all candidates from LinkedIn in the New status!" or "How many people from jobs did we reject because they were not a culture fit - does it make sense to advertise this type of position there?" etc.