Recommend you don't post domain name suggestions publicly for obvious reasons. Maybe ask for folks to check availability then pm suggestions for available domains.
This is a good point, just send domain name ideas in a pm to me. I didn't think it was a big deal since there are a ton of new gtlds coming out, it doesn't have to be .com or .org any more, but it might be easier to select the best of the bunch and put get the admin list to decide it.
Regarding spam, would it take too much time to just verify new accounts manually? How many legitimate new accounts can you get daily? Just send a form letter email to all new accounts a couple times a day, personal responses with a legitimate reason for wanting to post get enabled, the others get discarded. The job might even be entertaining, and a nice way to meet new members of your community.
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I'm not sure about this, Shattienator might know more about how possible/easy this is, although I do know spam accounts were a huge problem on coinzen.
Spam filters should be adjusted quite often.
But in any case it is not problem to manually verify about hundred accounts a day. Spam accounts usually have rubbish emails of very-very detailed description. Very few real users provide full description including full name, location, birthday, several hobbies and lot lot more - all at once
Mainly all spam accounts can be identified almost immediatelly.