Facebook assignment - Group

My friend wanna enrol in a social media course, so I signed in the course with her.
Here's the first assignment for the course - open a business group / interest group and try to attract as many people to sign up as possible.
I came up with the idea of a Shopping at Taobao tips as this website is a hit overnight in China. More and more people shop there and ship items over to Hong Kong. Some even stock items and resell them in ebay. But it seems like a similar group was set up in Facebook already. What I should do next? Any ideas?
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