Sony announce Nico Nico is coming to the PS Vita from today. the app is out today across the USA. Sony and Nico Nico have also announced the Sony E3 Press Conference will be live steamed via Nico Nico to the PSV.
I have honestly never heard of this service so unfortunately i can't really comment on what it is. it appears its a service that allows you to broadcast video and have others comment on it for others to see.
Source: USA Playstation Blog
