That headline is intentionally vague: it's hard to know, from short tweets and jerky YouTube videos, how widespread the protests are. the scale of what we're watching. All we know is that it's interesting; that you can follow along; and that it's happening right now. A few accounts on Twitter are worth your attention:

@tehranelection: "Right now where I live in Northern Tehran, the streets are gathering people...people are shocked from the results."..."My uncle, who is a police officer, told me that they went to three polling places and opened every ballot box and burned all the ballots..."

@IranRiggedElect: "The building of ministry of industry and mining is on fire in Tehran (Sa'adat aabaad)."..."Another police station in Tehran is taken over by people. The telecommunication building in Amirabad (tehran) is on fire."

Judging by @Iran09's tweets, broadband Internet is slow but up in Tehran; cell phone calls are going through; and text messages are still disabled after going down on election day.

Many of the accounts tweeting from Iran--both in English and Farsi--were created only in the last day.

Over on Global Voices, Hamid Tehrani adds some context and geographic knowledge to some of the citizen reporting. And don't miss this blog of videos and pictures, some of which are stellar.