I have always, and I mean ALWAYS wondered why people ask this question. There is no logic behind it once you THINK a little bit with that, ya know, BRAIN YOU HAVE. Oh yeah, that's right. Apparently for some people, it's impossible to use.
Blockland doesn't need mics.
If you want to chat with people, go on skype. HOLY stuff, that's so simple! Whoa nelly!