This was a huge thing for me.
I'd been on a number of forum communities beforehand, but I never looked at them as places for making friends until I joined the Brony community. Most of the time, you'd go on, make your posts, have a few discussions and that was that.
Here however, is a completely different story. Whether you want them to or not, people will send you friend requests and PMs like they're going out of fashion - and most of them do it because they genuinely want to get to know you.
Eventually, I joined a pony community specifically for Australian Bronies and the response was similar. Heck, one guy even offered to come up and meet me in person. I think my most positive experience however was the first in-person meetup I ever attended. I'd attended a lot of fresher events for different uni clubs, so I wasn't exactly unfamiliar with large social gatherings. However, unlike those events, I left the Brony meetup feeling really happy. Not happy in the sense that I'd accomplished something, but happy in the sense of feeling really satisfied and optimistic.
It took me a long time to pin down why I felt so happy, but in retrospect, I think it was because this group had such a profound sense of community. To illustrate what I mean, here are some comparisons between the Brony meetup and the fresher events I attended:
Freshers: Food was provided, but it was pretty basic and only one or two people brought anything.
Bronies: There was enough food to feed a god-damn army and nearly everyone brought something. Not only that, but most of the sweet stuff was home-made as well and I left feeling incredibly fat.
Freshers: People wore normal clothes.
Bronies: Everyone barring myself and one other person was wearing a pony shirt. While I'd later find out that most of those people don't usually wear pony shirts to meets, it did give off a certain "this is what we are, and we don't care what you think" vibe which was fun to be around.
Freshers: When people talked, they tended to stick to really specific topics. Eventually, a small group would dominate discussions and other people would chime in with something every now and again.
Bronies: Everyone was talking to someone, and peope talked about all kinds of stuff. I ended up getting into a really interesting conversation with a girl who works in her father's auto shop. She started helping him out from a young age, and ended up telling me lots of stuff about this antique car they were doing up.
Freshers: All we'd really do is talk, and occassionally share silly Youtube videos.
Bronies: We'd do that, but we'd also play a lot of card games as well. While I'm not hugely into MtG, I can at least thank them for introducing me to Cards Against Humanity... which i'm convinced everyone should try at least once.
So... yeah. I like MLP, but I probably wouldn't still be into it if it weren't for the fandom.