Google Noticeboard. It's a Firefox add-on can be used to create a message - including a voice recording and some text - which you can then send to other members, even if the other members doesn't installed Noticeboard you can still as audio as OGG email attachment.
I usually had a big problem on handling more social media website account. I think most of the users come across the same problem. Recently i had a chance to hear about Pixelpipe. On the very first look i really amazed about the features. Initially this site used to post your digital pictures, videos, and audio files to a growing number of different services with only a few clicks. This site seems to be similar as ping.fm, which allows post to text based messages.