You'd be surprised at how good we are at finding the things you post online. My practice is commercial disputes and white collar crime and social media is still a godsend for me when it comes to making witnesses look like crap (or tracking down someone who doesn't want to be subpeonaed). For my colleagues in family law, I can only assume it is moreso. Honestly, if you don't want it handed to you in hard copy and read in front of a judge then don't post it on the Internet. I charge $440 an hour to find it so I've really got no incentive to stop looking until I've found it.