It was introduced in Half Blood Prince and it is short for Slughorns club. He just wanted to find the top students he could find and discuss things and throw parties. But here, we will have discussions about how to improve Hogwarts Yearbook Blog and suggest things, about anything of Harry Potter, Pottermore, etc. And make friends! :)
JOIN JOIN JOIN!!
Give me your name, Pottermore name (If available), House and a reason you should be here!! Oh, and REBLOG REBLOG REBLOG!!!
JOIN JOIN JOIN!
Give me your name, pottermore username (if you have one), House and a reason you should be here!!!!!!