I read an outstanding quote in a Brad Thor novel that I think speaks volumes about how to make friends:

"Faith comes from trust, which comes from time, and experience"

With the Internet, and social media, it can feel like we have friends when we really don't. But what social media etc. has robbed from us is that before, we had to spend time with people, we had experience with them, and over time they led to trust, and friendship. That's how people made friends before. Now we don't put that much effort into friendships because we think we already have friends because we see them on Facebook.