@Summer Wish, As your topic deals more with the culture of the brony fandom rather than direct discussions of art forms and art resources, I've gone ahead and taken the liberty into moving your thread to Sugarcube Corner- we have all brony talk that doesn't much to do with the canon of the show here. Derpibooru itself (there's loads of lovely art of all types uploaded there that are allowed to be url embedded and shared in our own fanclubs, etc.) doesn't have taboo connotations in this community. Unauthorized exploitation of artworks and NSFW content does. (safe, cute, and totally community friendly gif I found on their well filtered homepage !)
I can't really say for your experiences elsewhere but you should be fine discussing Derpibooru here as long as you accommodate and respect our policies in turn.