Threadjacking/threadhopping?: Yeah, go ahead. It's more fun. Though I usually reply to two separate people as two separate threads.
In other words, that's what happens if you reply to just the post. If you reply to the other person, I'll assume it's all one thread.
4th-walling?: Depends, so I'd rather you ask me first. ^^;
Backtagging: Yes, RL
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