What is the ruling on sequential dhikr (remembrance of God) in online forums, and is it considered a halaqat dhikr (circle of remembrance), and an act in accordance with His, the Almighty's, saying: "And remind, for indeed, the reminder benefits the believers"?

Allah has urged remembrance (dhikr), and those of understanding remember Allah in all their states, just as Aisha, may Allah be pleased with her, used to say: "The Messenger of Allah, peace and blessings be upon him, used to remember Allah in all his states." What is mentioned in the question is a form of remembrance and cooperation upon it, and there is no impediment to it. However, it is not considered one of the gatherings of remembrance whose reward and virtue have been mentioned in the hadiths.