What is the most profitable long term online business?

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There are so many online earning opportunities as well as scams. Some of the short-term income could be PTC and recyclers but they really don't long and they really usually have problems maintaining a healthy account due to lack of solid profit. There are also other good affiliate programs with multi-level referral programs. Some already very well-established with awards like best business bureau etc. I do earn some extra monthly income online and it should be growing. How about you? Are you involved in long term or short term business online?