if your invested in twitter you also need to know this...Because the earnings of TWTR are not available, the Price to Sales and Price to Book ratios are the most appropriate valuation measures. Therefore TWTR seems expensive with a Price to Sales ratio of 10.13x, above the Interactive Media & Services industry median PS ratio of 4.52x, however their Price to Book is only 4.87x, inline with the industry median of 3.42x they are over priced, now drive them in the whole, big investors are supporting the stock, get out before they grab their profits and leave you holding the bag, like they did in 2008-9, bail before they do it's coming