For instance, he plans to prod dealers to part with cars more quickly by tracking their inventory and alerting them to slow-moving vehicles.

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The goal is to provide users a place to click in the ad itself that would let them opt out of receiving such targeted ads. (It doesn't turn off tracking altogether.) The program has been slow to catch on, new findings indicate.

WSJ: Latest in Web Tracking: Stealthy 'Supercookies'

Satellite and space expert Dr Stuart Eves stressed the large uncertainties involved in tracking the "decay" of satellite orbits (their slow fall back into the Earth's atmosphere).

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The SEC has already proposed a number of changes designed to address their growing influence, including extra restrictions on broker-dealers that provide direct market access to high frequency traders, a trader tracking system for large traders, circuit breakers that would slow trading in individual stocks if they fall more than 10%, and new rules for off-exchange trading venues.

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