1.0 link Rainbow Dash Network http://rainbowdash.net/ Toothpaste Pony! (minti) http://rainbowdash.net/minti http://rainbowdash.net/notice/1090897 @<span class="vcard"><a href="http://rainbowdash.net/user/9405" class="url" title="Kellen Smith"><span class="fn nickname">silverbrony</span></a></span> It's to categorize posts, like how spoilers are marked with #<span class="tag"><a href="http://rainbowdash.net/tag/spoiler" rel="tag">spoiler.</a></span> Most of us just use them for #<span class="tag"><a href="http://rainbowdash.net/tag/hashtagabuse" rel="tag">hashtagabuse</a></span> though, to make jokes and such.