It was reported that Telegram was the only thing that somewhat kept working when the internet was down country wide.

Also, I installed Telegram for the explicit purpose of following the events in Belarus directly from sources. By doing that I noticed that apparently the local press in my country have done the same, as it seemed that most of the updates in online media have come from the same Telegram channels. So, it has also served the role of information dissemination beyond the borders of Belarus at a time when journalists working there were harassed and sometimes imprisoned.