Isn't activity just a part of context?<p>Kick-about in the park -> simple activity, not many connections formed<p>Weekly football team -> training, trips, club events -> more connections formed<p>From my life the easiest connections are the ones where you're stuck together for a long time, eg education. You do pretty much everything together for years, you end up visiting each other's parents, you know each other's siblings, friends for life. In fact it's a reasonable test of how good friends you are with someone, whether you visited their house, know their family, know their friends, and know their CV.<p>Work is a little bit different. People are coming and going, there's a hierarchy as well, and also people are busy and have already got a friend group. That being said there's still the "always together" element so plenty of opportunity.<p>A more recent one is the "other parents in your kid's year". You end up hanging around your kid's friends parents a fair bit, and there's a fair chance they are similar to you. Which brings me to friend templates...<p>Meet a few people and like the article says, you will find many have similar attributes. Often you end up meeting people who have basically had parallel lives to yourself, in two ways:<p>- They literally have the same friends as you. I have this guy I went to school with briefly, who then turns up in all my friends' stories about what they got up to over the years, without me actually meeting him. Like a comedy show, he's just left when I arrive. I even had a random guy on an international flight tell me he was going to go see this guy, and I identified it because I knew so much about him. Anyway this is probably something that's happened to a fair few people, but they end up seeing the guy in real life and becoming friends.<p>- They have done the same things as you, unconnected. They went to your uni, or studied what you studied. They work in your line of work. When you were kids, you had the same interests. They're from your city. These kinds of people are great seeds for relationships, but there's lots of them, and not all of them are watered.