"Individuals will not be prosecuted simply for using Meta's services," TASS cited the prosecutor as saying in court.
But human rights lawyer Pavel Chikov said neither the court, nor the prosecutor could guarantee the safety of Facebook or Instagram users, warning that any public displays of Meta symbols - on websites, shop entrances, on business cards - could be grounds for administrative charges and up to 15 days in jail under Russian law.
"Buying adverts on both social networks or trading Meta's shares may qualify as financing extremism activity - this is a criminal offence," he wrote on Telegram.
Facebook last year had an estimated 7.5 million users and WhatsApp 67 million, according to researcher Insider Intelligence.