I shared SN in a discord community in which I'm relatively known and to which I knew SN themes were a good fit for. I got 4 new stackers from it. Two registered with my link, two others entered to SN directly. In any case, I shared it with them because I knew they where going to like it and with the exception of one, the other 3 are decently active, one of them pretty successfully. When I shared the link in another crypto community in which I'm less active, though small, none expressed interest (despite showing off my stake and all). So evidently the main driver is trust.