They all sound natural to this native ear. [edit: #3 the first time]
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Musicgold1. Do I come off to you as a person who would get into a shouting match with someone? 2. I am hearing of that group for the first time. 3. I heard of them first time at yesterday’s conference.Thanks,MGNeither #1 nor #3 them sounds natural to this speaker of BrE. I'd say: