Saif al-Islam al-Gaddafi, 49, appeared in social media photos in traditional brown robe and turban, and with a grey beard and glasses, signing documents at the election centre in the southern town of Sebha.
Economic activity in Libya is likely to rebound this year as the country rebuilds from civil war and oil production increases to levels last seen during Muammar Gaddafi's rule, the International Monetary Fund said on Tuesday.
Libya has started investigating foreign oil companies over their past relationships with the former Muammar Gaddafi government, an investigator with the ruling National Transitional Council (NTC) said on Monday.
Rival militias in the Libyan city of Sabha called a ceasefire on Wednesday after three days of clashes that killed nearly 50 people and highlighted the government's failure to restore law and order nationwide.
The contact from Syria called: "Be ready in 30 minutes," he said. "If you want to go, we have to go now."
The anniversary of Libya's revolt offered brief respite from fears that it has brought them only chaotic paralysis.
Muammar Gaddafi's son Saadi warned on Friday of an imminent uprising in Libya, saying he was in regular contact with people in the country who were unhappy with the authorities put in place after the ousting and killing of his father.
Interim prime minister Abdel Rahim al-Kib said today that Libya's new government following the toppling of Muammar Gaddafi's regime will be announced tomorrow.
World oil demand will be lower than expected this year and next as economic slowdown and high prices curb consumption, the International Energy Agency (IEA) said on Thursday.
A day after Libyans declared a "liberation" that consigned Muammar Gaddafi to the "garbage bin of history", hundreds again filed past his rotting corpse in a grim display that has raised questions about the nation's new direction.
Libya's new rulers declared the country freed from Muammar Gaddafi's 42 years of one-man rule on Sunday, saying the "Pharaoh of the times" was now in history's garbage bin and a future of democracy and postwar reconciliation beckoned.
Racing to fill a power vacuum, Libya is to declare a war against Muammar Gaddafi's one-man rule over on Sunday and start building the multiparty democracy he once derided as being for "donkeys".
Dragged from hiding in a drainage pipe, a wounded Muammar Gaddafi raised his hands and begged revolutionary fighters: "Don't kill me, my sons." Within an hour, he was dead, but not before jubilant Libyans had vented decades of hatred by pulling the eccentric dictator's hair and parading his bloodied body on the hood of a truck.
Muammar Gaddafi was killed by Libyans, succumbing to wounds on Thursday in his hometown of Sirte.
Deposed Libyan leader Muammar Gaddafi died of wounds suffered in his capture near his hometown of Sirte on Thursday, a senior National Transitional Council military official said.
Travel Postcard: 48 hours in laid-back Niamey, Niger
Libya's new regime forces aimed to take full control of Muammar Gaddafi's hometown Sirte today after seizing key targets in the face of fierce resistance from his diehards.
Fighting raged for Muammar Gaddafi's birthplace today as Libya's new leaders eyed a symbolic victory in their battle to eradicate the last vestiges of his 42-year rule.
Libya's former rebels have surrounded the ousted dictator Muammar Gaddafi, and it is only a matter of time until he is captured or killed, a spokesman for Tripoli's new military council said today.
Libya's new leaders moved to restore order to Tripoli today, instructing fighters from the provinces to go home as they prepared to transfer to the capital from their wartime base in Benghazi.
Libya's new leaders won massive international support for their plans to rebuild the war-shattered country but faced threats of a long guerrilla war from defeated strongman Muammar Gaddafi today.
Libya's oil production can restart within weeks and reach full pre-war output within 15 months, the newly-appointed chairman of the country's National Oil Corporation (NOC) said on Tuesday.
Libyan rebels said today that strongman Muammar Gaddafi still poses a danger to Libya and the world, as insurgents closed in on his hometown of Sirte a week after overrunning the capital.
Libyan forces converged on Muammar Gaddafi's hometown of Sirte on Monday, hoping to seal their revolution by seizing the last bastions of a fallen but perhaps still dangerous strongman.
Rebel forces began to purge Tripoli's streets of diehard gunmen still loyal to fugitive Muammar Gaddafi on Thursday in the final phase of the battle for the Libyan capital.