Fifteen.

Until then, you can still post the url of the site, just uncheck the "Automatically parse links in text" box under the Submit button. It won't be a link but people can just copy/paste the url into their address bars if they want to see the site.

Or, you could tell people the Google search term that will bring a link to the site right up.

Or, you could just post a lot of your own personal opinions until you have fifteen posts and then link away.

__________________
Thomas Jefferson:
"All tyranny needs to gain a foothold is for people of good conscience to remain silent."
"A coward is much more exposed to quarrels than a man of spirit."
"Banking establishments are more dangerous than standing armies."
"Every generation needs a new revolution."