Organize speed dating session
It gives people who are speed meeting a bit of privacy.Sitting at tables all over the room (or just in two chairs) is preferred, so the murmur of the conversations does not interfere with the participants' ability to hear.
When participants know each other these responses are best heard by all participants including the facilitator.
Write your suggested topics on a note card, a whiteboard or project them on a wall.
You don’t want participants spending their two minutes trying to remember what you suggested they discuss or trying to look at a laptop screen or smartphone screen to remember.
If you want them to meet everyone, switch the position of your ones and twos for the next round of two-minute introductions.
Keep your suggested topics simple as two minutes is not a lot of time for both people to respond.