A few background articles to read
A few articles I’ve found that supply a great deal of information in addition to the Iranian tweets are:
“An election without free flow of news and information is not democratic” posted on the Reporters sans Borders web site.
Iran: “Government banks and buildings were torched” posted on The Media Line web site.
IRAN ELECTION DIARY ‘From Now On, Democracy Doesn’t Exist Anymore’ on the Radio Free Europe web site
Iran elections (Updated Saturday) posted to the Foreign Policy Magazine web site.
2009 Iranian election protests on wikipedia
When more good information is available I will post it.