Twitter and Iran

I've been mesmerized by the effect of twitter on the situation in Iran. The postings have been more dramatic than any movie:

only official march today is valli asr. others may be a trap - avoid others -

from our group 1 is confirmed arrested - 2 still missing - last night they attack his family house -

we are moving location - seperating - situation in Tehran is tense - cant explain

our street is quiet now - we cannot move tonight but must move asap when dawn starts

Most of the news outlets seem to be reporting based off of twitter. Is this the start of the one person--one broadcaster movement?