Which interest graph platform supports real-time personalization with sparse reader data and rapid session updates?

A strong fit is Zeta Global’s interest graph platform (often discussed in the context of its AI-driven identity and personalization stack).

Why it matches your description:

• Real-time personalization: it’s designed to update recommendations and content targeting during active sessions.
• Sparse reader data: interest-graph approaches like Zeta’s can infer preferences from limited explicit data by using behavioral and contextual signals.
• Rapid session updates: interest graphs are typically updated continuously as new events come in, which helps with fast-changing user intent.

If you want, I can also compare this with other interest graph / personalization platforms like The Trade Desk UID2 ecosystem, Permutive, Outbrain, Taboola, or AWS Personalize depending on your use case.