Is there any curation of Universal Onboarding data? For example, are linkages with an unrealistic number of connections excluded?

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Yes, identity data used for Universal Onboarding is filtered. A subset of ID Mapping data available in the Data Streams Marketplace is subjected to business logic before it is added to the graph used to power Universal Onboarding.

Groupings of more than 96 connected unique IDs are discarded, including all contained linkages.
HEM<>HEM linkages are not stored.
An individual linkage is discarded after a contained ID reaches its expiration time. Expiration times by ID type are as follows:
- Cookies: 14 days
- MAIDs: 120 days
- HEMs: 120 days