Thank you for this comment, bc I did some real percolating on it and I am happy to answer you.

I tagged it that way bc often I’ll see posts on my dash where someone has used a gif from a source, which hasn’t been tagged, and I’ll see tags or comments like, “Who is this hot guy?!” “Where is this from?!” which is so sad, bc they might really want to know and get into that fandom! So in tagging it #Supernatural, it’s actually free advertising BACK to Supernatural; someone might see my post on their dash, and think, “What is this from? Oh, it’s tagged Supernatural. Maybe I should check that show out, this guy looks like he could be a great actor…” And then you might gain awesome fresh blood in your fandom, who could turn out to be your new best friend (or even something more!, ppl meet the love of their life through fandom, I kinda hope to do so, too) ^_____^

I also enjoy the fact that other fandoms bleed into each other sometimes, bc fandom is an umbrella concept over so many of them (if not all). There are even crossover fanworks (fic, memes, etc.) between fandoms and different works of media, often enriching the experience of both. Especially when you have someone who can make really great meta-analysis comparing some aspect of one fandom to another, they might even make you ship smtg you never thought you’d ship.

As an example: One of our fandom ppl has moved onto the MCU!Avengers, but specifically the Steve Rogers/Tony Stark ship, and they convinced me that that ship has alot of similarity with Louis/Lestat. And now I can’t unsee it, and you could all lose me to Stony someday.

^Lestat/Louis meet Tony Stark/Steve Rogers, hilarity ensues. This is a fanwork that crossovers two different fandoms, and so much is conveyed without any dialogue at all, it’s all in the facial expressions and body positions and it gives me such feels whenever I look at it. Drawn by @americancaptaincomic​

All that said, I’m sure I’m not the only one who has posted that gif with the #Supernatural tag. If you want a pure SPN tag, you can run your own blog and keep it as pure and clean as you like! And I don’t say that w/ any intended sassy attitude, it’s just a fact, and even though I wanted to keep my blog purely VC, I have found that embracing other fandoms is more inclusive and really does enrich the experience.