Do: post your summer plans on Facebook. It's a nifty feature.Don't: post about the company you're set to work for on your own site. Everyone's favorite Syed lost a summer job at National Instruments because he slammed the company's product on his LJ, and they *somehow* found it and rescinded the job offer. It's unfortunate, and perhaps unfair, but it's definitely legal, so be careful, kiddos.