Actually, in targeting, user's short term interests are much more valuable than the long term interests. If a visitor is on HN, you would already know his immed

Actually, in targeting, user's short term interests are much more valuable than the long term interests. If a visitor is on HN, you would already know his immediate interests. Knowing that he came from a Python tutorial site, that too you can't say if he is regular there or one and off, would provide marginal value which is hard to justify.