$TWTR is one of biggest losers #stocks today. read more:

Twitter, Inc. Common Stock (symbol: TWTR) was one of the worst losers of
the trading day today (2015-07-29), losing -14.5%. The number of shares
that changed hands was 92,628,680, or about 4 times the average daily
volume in the stock.
The closing price was $31.24, amounting to a market cap of $20,240,000,000,
about -44.2% off the highest price in the last 12 months. The stock has
been trading at a range between $31.06 and $55.99.
TWTR is in the Computer Software: Programming, Data Processing industry,
part of the Technology sector. It first went public in 2013.