If the rebels take Jarablus, it would preclude an assault by Kurdish forces who hope to expand their reach.
Authorities blame the Islamic State for the suicide attack on a Kurdish wedding party, with the bomber said to be a child.
The microblogging platform has previously come under fire for not doing enough to stop accounts linked to Islamic State militants.
Islamic State has had trouble expanding beyond its base in Iraq and Syria, as the Taliban and al Qaeda still hold sway in Afghanistan, Pakistan.
Iraqi prime minister Haider al-Abadi says Mosul's fall would mark the defeat of ISIS in Iraq.
Sinai Province is believed to be behind the downing of Metrojet Flight 9268.
Obama called recent coalition efforts a "major success" against the Islamic State.
One friend reportedly uploaded a picture of an Islamic State militant holding a gun.
Suspect's kin under investigation on 'suspicion of terrorist association with a view to perpetrating a crime.'
Kermiche had been a sports-mad fan of "The Simpsons" and Rihanna before he was radicalized.
Trump dismissed any suggestion that Putin's intelligence services might have had a hand in hacking the Democratic National Committee's email system.
More than 80 were killed in the Islamic State attack on protesters from the mainly Shi'ite Hazara minority group.
Displaced residents are still waiting for Iraqi city's streets and buildings to be cleared after troops routed the Islamic State.
Air operations were halted while Turkish authorities put down a military coup attempt.