You can now avoid meta keywords because they are no longer as important as they were before for search engine optimization. Many search engines know that websites can “game” their meta keywords field through black hat keyword stuffing. Hence, Google puts no importance on meta keywords in its ranking algorithm. Google puts more importance on meta descriptions and title tags, as previously mentioned. Nevertheless, they still form a helpful part in the communication of your message.
Two-tier programs exist in the minority of affiliate programs; most are simply one-tier. Referral programs beyond two-tier resemble multi-level marketing (MLM) or network marketing but are different: Multi-level marketing (MLM) or network marketing associations tend to have more complex commission requirements/qualifications than standard affiliate programs.
This article includes a general overview of types of affiliates and agreements. Every business situation is unique, so be sure to get help from an attorney in preparing any affiliate agreement. There may be "gotcha" clauses or language that you may not have seen or included. For example, if you are the affiliate, check to see what percentage of ownership, if any, the other company has in your business.