I have not heard of Buzzirk Mobile or GlobalVerge. I do have some past experience with MLM.
MLM succeeds through referral marketing - telling family, friends and associates about good products, services and/or deals you get, then earning a referral commission if and when they buy it. It can be a good experience if a person is confident or skilled in that personal style of marketing. However, the majority of people do not have that level of interest or confidence.