I hope when i'm older I have better things to worry about than being paranoid about people stealing my stuff, to the point that I don't enjoy it and take it out for others to enjoy in fear that someone might write down the lisc plate number and try to come and steal it. LOL Life's to short to live, fear, not enjoy it and there is nothing anyone can do about social media. Any single person at a cars and coffee, driving down the road, a persons work or such could write down lisc plate numbers etc, post on fb, instagram, forums etc imo. Deleting your self off social media wont fix or change any of that imo.
As a kid when we traveled I wrote down lisc plate numbers on paper when we traveled long distances for something to kill time.