Machado had left the country just a month before the US government seized Venezuelan President Nicolás Maduro.
Serbia is heading to the polls as a student movement attempts to oust longtime populist leader Aleksandar Vučić.
He will be observed to evaluate whether his "psychiatric health is compatible with pursuing his interrogation", authorities said.
The authorities had justified the ban by saying online content was fuelling conflict, while the opposition had condemned it as an abuse of power.
Nayib Bukele says bodies delivered to soldiers are "not our men" amid search for Salvadorans abducted last week.
Hundreds of thousands took part in demonstrations in France, with protests also taking place in other European countries.
The tech billionaire accuses Ukraine of violating its terms of service by using the network for military activity.
That Girl Boina's post about why she had closed her beauty parlour struck a nerve with other small business owners.