Man, good questions. Did you copy them off a website?
Suppose I'll answer a few of them.
What would I consider a friend? Probably someone who I at least hang out with in real life, and who would like to do stuff with me without me asking them or approaching them all the time.
How many friends would be ideal? Good question. Used to think only 2. 2 friends is all I really needed for a long ass time.
But now I've lost both of them, with one of them turning out to be an asshole, and another moving far away. So maybe it wasn't such a good idea only having 2. Especially now I gotten older, where everybody else my age is so busy with their personal lives. I think probably like maybe the recommended 5 or so by psychologists. I now see their point.
How much effort? A lot. I have no life, I can afford to put effort into keeping friends.
How long before their behavior is considered ghosting? I dunno. Good question. Probably if they say they wanna hang out and when the time comes to hang out they just don't text me to confirm whether they can come or not.
Yeah I figured it's kinda intrusive to make friends with busy lives. However, I was criticised by my ex-friend for not ever asking him to hang out, so I felt kinda bad if I didn't ever do that. He was always busy whenever I asked him to do so though, so maybe it was wrong of him think that though...
Friends with specific interests? Yeah I'm trying to do that here and on DeviantArt, as well as on Instagram. It's really daunting though, I'm not sure about online etiquette or anything, and I'm wondering about how to best contribute to forum conversations and stuff like that. Can never think about what to say...
Lines can be blurry on friendships? Yeah, that's definitely the case here. Too afraid of communicating with them about it though, afraid of annoying them...
Anyway, thanks for the insightful reply!