Facebook, How we shorted an overbought stock

Facebook got into overbought zone in RSI indicator as it hits 70,also it coincides with the trend line resistance shown in the chart. I also saw a big bearish positioning in options for the downside in the stock. Therefore it was an easy decision for me to short it as I had three different confirmations. I shorted it on July 16th, on July 17th it tested the resistance. Finally on 18th it fails at resistance and kept going lower. I locked my profits on 19th July- 4% profit in 4 days. One could have made much more profits with put options.Chart provides further details

All of the trade results above are illustrations of the principle.