I am partially involved in this, so please don't delete this post.
Yesterday, someone logged in under your name was constantly showing up in my house, glitching through the walls, and saying offensive things to me(Ask 2Crzy and Daniblue, they both saw this). Was this you, or was it your friend?
Edit: I also found out that he griefed most of the glowstone streetlights in my city.