Call it the biggest Facebook mistake ever. A daughter’s snarky status update has cost her father the $80,000 settlement he won in an age-discrimination lawsuit. According to the Miami Herald, Patrick Snay, 69, was the headmaster at Gulliver Preparatory School in Miami for several years, but in 2010, the school didn’t renew his contract. Snay sued his former employer for age discrimination and won a settlement of $80,000 in November 2011. The agreement contained a standard confidentiality clause, prohibiting Snay or the school from talking about the case. However, Snay’s daughter, Dana, now at Boston College and a part-time Starbucks...