Subscribe | UPI Odd Newsletter Subscribe SYDNEY, May 28 (UPI) -- Police in Australia are warning people to be cautious online after a picture of cash posted to Facebook led to a home invasion robbery. New South Wales police said a 17-year-old girl was helping her 72-year-old grandmother count her savings at the older woman's Sydney home May 24 and the teenager posted a picture of the large amount of cash to her Facebook page. Advertisement Police said two men armed with a knife and a wooden club entered the Bundanoon home of the girl's 47-year-old mother while she was home with a 58-year-old man and a 14-year-old boy. The men demanded to speak to the girl about the cash and the mother informed her that the teenager no longer resided at the address, police said. The men took a small amount of cash and personal property from the home, police said. New South Wales police said the incident highlights the need for caution when posting photographs and personal information on social media sites. Read More Facebook to buy Opera Web browser? Lawsuit filed against Facebook Morgan Stanley eyed in Facebook IPO Pakistan lawyers seek Facebook ban Facebook as public firm has some jitters Bono downplays Facebook earnings