Shares of Twitter (TWTR) have been retreating since price tagged 21.00. From a technical perspective TWTR seems to have stopped the bleeding and could be building an uptrend. If this is the scenario, we can consider buying around key support factors that TWTR is approaching.TWTR 4H Chart 8/23(click to enlarge)Central pivot:- The 4H chart shows a market that has flattened since February. - After months of further consolidation, it looks like TWTR is developing an uptrend.- After breaking 20, price is retreating back towards the middle of the 2016-range.- We can consider the 17-17.50 area as the central pivot. - Note that this area could be reinforced by a rising trendline. - Furthermore, if TWTR is developing an uptrend, we should see the RSI hold above 40. Trade consideration:- If we believe TWTR has turned the corner, we should consider buying around this area, even around 18. - Let's examine the risk and reward of going long at 18.- If a stop is below 17, let's say 16.50, we would risk a little under 10% for a potential gain of 16% just to get back to 21.