Put your requests in here to join Gryffindor, Hufflepuff, Ravenclaw or Slytherin. You can then enter the Common Rooms for the House of your choice and meet other House members to discuss House matters in private.
25 may sound like a lot, but once you get into all the topics here, you'll have that many in no time!
Just be sure they're worthwhile, and you'll be a Ravenclaw before you know it.