Praveen,
I was somewhat puzzled when you first posted this message and said that you were buying as a "contarian" move because of all the "gloomy" news stories. I was puzzled because I would have thought that the contrarian move would be to wait and buy FB after it had fallen and most traders didn't want anything to do with it.
If I remember your system correctly, you take a relatively small, but consistantly sized, position in many stocks (say $2,000 each and 30, 50 or 100 stocks over time) and hold for a year, then re-balance or get rid of a stock at that time. Do you use any other type of stop loss method? I think, if I were using your system, I would trust the method entirely and not use any Stop Loss. A total loss (unlikely) on one stock would not be a very large percentage of the portfolio. But I may very well want to not allow too large a loss on a stock like FB, which it seems you took on largely as a "gamble".
I do like the idea behind your system.
Bob