What did E-commerce bring to small and medium enterprises under the economic crisis?

The global environment of Economic crisis, the survival and development of SMEs is even more difficult which make some firms began to enter e-commerce platform for online marketing. Some good corporate earnings have be gained, but this is only a small part of medium-sized, the vast majority of SMEs have not yet entered, or just entering the e-commerce platform. Even if access to the platform, they are worried, little is known about the e-commerce and they do not know the specific number of customers and orders they can get.