I get annoyed when I ask people to reply and they don't. I wish people would explain themselves, at least. If they, all of a sudden, block me somewhere and don't give me a reason, I get very frustrated and can't stop thinking about it for months. I hate loose ends; everything has to be resolute for me. I need to be completely aware of everything that goes on around me, otherwise I become very insecure.
I myself have issues replying to people's PMs. Sometimes, if someone sends me a PM and I look at it and think, I am probably going to write a very long essay in reply to this that will take a lot of my time. I sometimes can end up replying to them one or two months later. It might cause some doubt in people, they might think that I'm ignoring them, but yeah, that's the only reason. It's like me procrastinating with schoolwork; I think that it's going to be too much for me to do, so I put it aside for a while.
I sometimes might oversee someone's question, too. That's not because I'm ignoring it, but because of a lack of an attention span for a body of text. I often have to re-read the message several times in order to get the full meaning, and might reply in a hurry.
Online communication one-on-one is frustrating for me. I need to meet the person in real life first in order to figure out how I should talk to them. I need this visual conception of the person so that I could formulate appropriate responses to what they say. It might also be the fact that I'm extroverted; except for my special interest, I have a low tolerance for introverted activities.
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Leading a double life and loving it (but exhausted).
Likely ADHD instead of what I've been diagnosed with before.