General
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How about a price for two or more seats?
Eg. £6 per seat. £2 for each additional seat.
6 votes -
allow alternative authentication mechanisms
Personally I do not like Facebook's privacy policies so never use my Facebook credentials to log in to third party websites.
By only allowing people to actively use your site using a Facebook ID means that I will not use your site.
4 votes -
4 votes
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Consider some safety assurance.
Consider some safety assurance. What about a premium identity verification service like Paypal use? For example tie a user to a landline telephone by calling them, or store a scan of a passport or bank statement / addressed letter?
3 votes -
2 votes
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Create a group structure
Let people group themselves by the company they work for or the school that they attend.
1 vote