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A simple example: a maintenance or even a cleaning service company that offers its services only for business, should it have an active Facebook page, twitter ... etc ?
I believe so, I am specialising in it. Currently i am reading "Services Marketing" by Zeitmal and also doing case studies on Services Organisations. Services Marketing is about differentiation and Social Marketing is a great way to create awareness and brand image in the minds of the target audience for the following reasons.
Yes, just because its presence is important, not because it will be an effective tool for B2B. It will have an effect, but not like a B2C organization's presence on social media. In the end, all decision makers are consumers.
Ideally you should join the gang! No social media presence does not look good to any professional organisation. Linkedin is a good channel for B2B companies.