Do i need proxys to send mass messages?

To be honest i believe that facebook are not bothered about the IP you sign in from. They only seem to pick up on mass messaging when you include a coded url with the http:// then they display a captcha. So if you include an uncoded link captcha is less likely to come at intervals. I dont think you should have a problem. I guess the best thing to do is just give it a go!
~DJJ