We've never changed any of them, part of the reason we haven't added some is that they cause a great deal of formatting problems and make it difficult to read content, especially on mobile which is over 40% of all of our visitors. That exploding head for example pushes the line that its on down by nearly 4 rows which ruins the paragraph it appears in. There are some smilies that also tend to just be used for one symbol junk posts, that flame one being a perfect example, someone will post it then 10 others will post the exact same thing, both trashing a thread and keeping it bumped at the same time to everyone's annoyance.
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