Under SEC regulations, all communications with potential investors surrounding your crowdfunding offering must be made on the platform; i.e. your MicroVentures offering page.
Every offering page includes a Discussion section where potential investors can ask questions of the issuer. The reasoning for this is that all potential investors must have access to the same information. Should a potential investor reach out privately with a question about the offering, issuers may either 1) direct them to the discussion section of their offering page or, 2) answer their question, then transcribe their question and the answer to the discussion section.