As a channel to communicate with the manufacturer. A lot of companies which are active on Twitter, you uses to count contact. You can use Twitter as a channel for complaints or queries.
Channel contact the manufacturer. But there are many company's Twitter accounts, used to contact you. You can use Twitter as a channel to complain or ask for them.
channel is in contact with the manufacturers. Many companies are the account on twitter, you use in contact. You can use the Twitter as channels for complaints or inquiries.