None of the above. In the first few days of Destiny, everything was so fresh and new and exciting. I did a strike with someone (Phogoth seemed so hard at that time) and when the third dropped out, I messaged my random teammate, "I can't believe we cleared that with just two people!" And the guy friended me. After careful consideration (I was new to online gaming), I friended him back. In another strike, playing with another couple of randoms, I think two of us just messaged each other "Nice strike!" The guy friended me, so I friended him back. So the first guy- I only played with him twice more ever in Destiny. But the 2nd guy- we wound up playing almost every night for the first year and a half of Destiny. I met his friends (real-life friends and co-workers), and eventually we formed a clan. The clan has since expanded, with members inviting their friends and relatives. While most of the clan doesn't play that much Destiny any more, we still get together to run Iron Banner teams, which is always a blast. And back in year one, we got together and made sure everyone got their year one moments of triumph, filling out hard mode VoG, hard mode Crota, and Skolas for those who hadn't yet completed them. The other friends I've met through Destiny (outside of the clan) were similar circumstances. One guy I met with a clan mate as the 3rd player (random) doing the Sleeper Simulant quest. Another player I met just doing strikes with my buddy- we ran a whole bunch of strikes one night, and this player stayed with us for maybe 5 strikes. She played in a similar style to us (we kill everything in the strike), so I commented on this. She friended me, and I friended her back (we've only played together a couple of times since- but I've played with the Sleeper Simulant guy a lot). I met the people I play with currently through my clan. Two of our clan members (newer- started with year two) were hard-core raiders. One time they came out of a raid with some raid teammates and invited two of us (clan members) to an Iron Banner team. One of the raiders friended us, and in the following weeks, persistently invited us to raid (we'd only beaten King's Fall once on normal). So eventually I accepted, and wound up becoming a regular on the raid team. With the clan playing less frequently, I mostly play with my raid team these days. So I guess for me, it was just playing a lot, finding someone who plays in a similar style, maybe sending a friendly message, and maybe they respond by adding you.