Nothing wrong with taking your profits. AMZN is still a long, but perhaps a bit over-hyped recently. The problem with these tech stocks is the lack of historical data and comparison against sector or competition. They're too new. Microsoft, IBM and Oracle cannot be used as benchmarks or competitions for them. Their P/E means little for now.
I hear AliBaba has got a concrete support at $180. It won't go below it no matter how many people short it. More than $25 Billion sits on shorts against AliBaba (only 5% of its market cap but still significant).
What a day. I'm glad I took some profits. Bought some Fedex today @ $240. Hopefully a quick turn around is in the books and if not FDX is a long time hold. I was happy with Twitter today but because of the overall market it didn't go up enough. The same with Snapchat.