As I was surfing around twitter, I found this account that said to be own by SS501's maknae, Kim Hyung Joon. I am not sure if this twitter account is really own by HJ, because he does follow some people who are obviously out of connection, but what makes me doubt as to whether this is his twitter account or not is because, his younger brother, Kim Ki Bum of U-Kiss is following him on his twitter account.
You guys decide. What do you think? Here's the link to the account I am talking about.