#2. I find that silly. Sort of like the old "write complete sentences" dictate back in my school days. So if someone asks, "Hey, do you want to ride together to the party on Saturday?" I can't just write, "sure!"? I have to write, "Yes, I want to ride together to the party on Saturday."? Nope.
I do just write, "sure!" and figure that the other person will then respond, "I'll pick you up at 7" or "do you mind driving?" or whatever.
#3. If by "respond" they mean click "like" or answer if it's a question, sure.
#4 is not hard and fast. Say someone calls me and I'm in a situation where I can't answer the phone and have a voice conversation, but I can text. I might text and say "Sorry, I'm in a meeting. I can text if that works." This happens all the time, both with me as the caller and the called. No one bats an eye.
#7. Yeah. I dunno. If I get a text or a tag on Facebook or whatever, I don't really think that means I have to drop everything I'm doing and respond. That's the whole point of electronic communication vs. calling on the phone. You reply at your convenience. Sure, if the message seems urgent, it's courteous to reply asap. But I'm not always even able to look at a message immediately. And sometimes, as Airelenaren said, I need time to formulate a reply.
But yeah, #15. If I've sent a text message that actually does require a reply, and you don't reply, with at least something like, "I'm not sure, can I get back to you?" and then I see you posting on Facebook, it does feel a bit crummy.
#8 I don't talk much on the phone but I almost never leave a voice mail. I'm pretty much calling someone who has my number and if they don't answer, I usually send a text. If I'm contacting someone who doesn't have my number, I send a text first. I just find it easier that way.
#9 Yeah. Major annoyance. I just reply and re-ask the unanswered questions. Whatcha gonna do?
#10. I have one facebook friend who does this. I pretty much NEVER "like" anything that is shared/reposted from another source unless it is some kind of really important (to me) information that I wouldn't have known otherwise. This friend must just post every silly item that comes her way, cat pix, cutesy sayings, religious memes, etc. Even reposting that exact stuff from a year ago, you know, a "memory". Ugh.
#12. Ditto what Airelenaren said.
#13. Current accepted method in my group of friends seems to be email. As in, "Mary's mother died", which the particular group needs to know. But if you're talking something more personal, like "your husband was in a car accident" then yeah, phone call.
#14. Angry? Yeah, probably not. Annoyed? That's more likely.