Answer: C) Two-way information flow can give the company customer information and insights.
Step-by-step explanation:
An online community, can also be referred to as the also web community, and this simply means a community whereby the members can interact with one another through the Internet.
A key marketing benefit of forming an online community by GlaxoSmithKline is that there'll be a two-way information flow that can give the company customer information and insights.
For example, through the use of social media, the company can communicate with the customers and also get feedbacks from them.