Used at first for instantaneous meetings, it has the potential to organize large groups using emails, blogs and text messaging to attain targeted aims. Combined with SocialEngineering corporations could use it to influence market behaviour.
Such a large-scale technology should have serious legal and regulatory constraints, especially if used in a collusionary fashion.
As an example:
Because of the decentralized aspect the other individuals involved may not know the effect of the overall system on the target person or persons, and makes it difficult to pinpoint intent, assuming there is any. However the effect is like a laser, though the medium is not light.
An amusing (yet scary) example of this is Bruce Sterling's story "Maneki Neko".