The ONLY way Anyone can get your IP and use it to "track you down" is if you click on a link to an external website that was set up by the police.
Like if there was a link
www.clickme.com and you were logged in and went to the link, If the website was set up by police or the police had access they could Potentially get your actual IP. The IP would only give them your general location, like your city, and your ISP. They could contact your ISP and potentially get your account info with the IP.
But the fact is for ANY of this to happen it would require a lot of warrants and court orders, etc, from judges. So you would have to be under serious investigation for this to happen.
The other problem is, the cops or law enforcement or whoever could get the info would have absoutely no way of proving who was logged into the account at what times. All they would know is theres pictures from a random person online.
But most of us around here dont have to worry....We're all medical growers who dont sell weed....
And if you dont have medical status I sure as hell hope your not sitting at your grow house, Online with internet in your name, and on here, logged in, posting pictures of your grow...lol. Dont set up internet or anything at an illegal grow house.