Prime Minister Tayyip Erdogan has vowed to "wipe out" the social media service, setting him against President Abdullah Gul and drawing public fury.
Two people have been killed after clashes between supporters of Malawi's ruling party and its opposition.
Observers say elections in Southern Africa this year are vulnerable to manipulation and misuse of the military to clamp down on opponents.
As Mozambicans prepare to cast their ballots in local elections, there have been concerns that an upsurge in political violence will affect voting.
Guineans got to the polls in the first parliamentary elections for more than a decade in the troubled west African nation.
Chancellor Angela Merkel has captured a landslide victory in German elections for guiding Europe's top economy unharmed through the debt crisis.
Angela Merkel is favoured to remain German chancellor for another four years as voting gets underway in the country.
South Africa's transition to democracy is held up as an example but the old underlying problems endure, writes Jaap de Visser and Nico Steytler.
President Jacob Zuma seems impressed by his neighbour's antics over the years, and is not ashamed to celebrate Robert Mugabe's election, err, win.
Mali's presidential election will go to a second round on August 11 after no candidate has managed to secure a majority in the crunch poll.
Mali's presidential election will go to a second round on August 11, after no candidate secured a majority in the landmark poll.
The M&G Zimbabwe Elections voting trends site is an attempt to give citizens access to information, despite Zanu-PF's claims to the contrary.
Vote counting is under way after Zim's tightly fought election, which observers say was "orderly and fair", despite charges of vote-rigging.
Hassan Rouhani has a lead in Iran's presidential election, garnering nearly 51% of the vote at 76% of polling stations, says the interior ministry.
Voters have begun registering for elections in Swaziland, Africa's last absolute monarchy, with unions calling for a boycott of a "rubber-stamp" poll.
Pakistan's cricketer-turned-politician Imran Khan has injured his head after falling at a rally just days before national elections, say officials.
Malaysian politicians have made a last campaign push as Prime Minister Najib Razak's coalition competes against the opposition ahead of the elections.