President Erdogan met Nigerian counterpart Buhari at the Presidential Palace in Abuja, with both leaders vowing to deepen ties and cooperation.
Parents raised and paid an undisclosed ransom to free the students, who were among more than 100 taken on July 5 from Bethel Baptist High School, officials say.
Heavily armed bandits have recently stepped up attacks on schools, kidnapping students for ransom, prompting a military response.
The arrest of Biafran leader Nnamdi Kanu comes amid growing tensions around regional divisions within Nigeria, and armed separatism in the southeast.
By barring 40 million users from using the platform, the government has effectively silenced ordinary Nigerians and taken away financial opportunities from them.
At least 11 people were killed in the attack in Igangan in Oyo state late on Saturday, police said.
Social media giant was being used for activities "capable of undermining Nigeria's corporate existence," officials say.
The state government is in talks with gunmen who seized 136 children from an Islamic seminary over the weekend, the latest in a string of mass kidnappings in the country.
More than 700 students have been kidnapped for ransom since December by armed groups after raids on schools and universities in northern Nigeria.
The mass abduction of students by unidentified gunmen took place after the chief of the Nigerian president's All Progressive Congress was gunned down in a different part of the country.
More than three dozen bodies pulled from the water by Nigerian rescue workers, after an overcrowded river boat sank leaving more than 150 people missing who are feared drowned.
Could the planet finally be on track to limiting climate change? After US President Joe Biden ramped up ambitions with a climate summit, experts are cautiously saying yes — although a difficult path lies ahead.
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