As for etiquette, it's pretty much about grabbing them. I've never seen anyone get upset over using one of their plurk emotes. They're kind of communal--you just add one from someone, and when you stop using it, you delete it and add a new one. If you spam them all the time you might bother someone, but for collecting them? Just find one you like, hover over it, and add it.
Also now I want to change my Colors username to [concerned_hamtaro]...
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As for etiquette, it's pretty much about grabbing them. I've never seen anyone get upset over using one of their plurk emotes. They're kind of communal--you just add one from someone, and when you stop using it, you delete it and add a new one. If you spam them all the time you might bother someone, but for collecting them? Just find one you like, hover over it, and add it.
Also now I want to change my Colors username to [concerned_hamtaro]...