Fitbit forecasts third-quarter revenue below estimates <!-- no image --> <div>Wearable device maker Fitbit Inc forecast third-quarter revenue below estimates on Wednesday, sending its shares down 13% in extended trading.<div class="feedflare"> <a href="http://feeds.reuters.com/~ff/reuters/UKBankingFinancial?a=xP9u8_sypik:I3CdxKDUvd4:yIl2AUoC8zA"><img src="http://feeds.feedburner.com/~ff/reuters/UKBankingFinancial?d=yIl2AUoC8zA" border="0"></a> <a href="http://feeds.reuters.com/~ff/reuters/UKBankingFinancial?a=xP9u8_sypik:I3CdxKDUvd4:V_sGLiPBpWU"><img src="http://feeds.feedburner.com/~ff/reuters/UKBankingFinancial?i=xP9u8_sypik:I3CdxKDUvd4:V_sGLiPBpWU" border="0"></a> <a href="http://feeds.reuters.com/~ff/reuters/UKBankingFinancial?a=xP9u8_sypik:I3CdxKDUvd4:F7zBnMyn0Lo"><img src="http://feeds.feedburner.com/~ff/reuters/UKBankingFinancial?i=xP9u8_sypik:I3CdxKDUvd4:F7zBnMyn0Lo" border="0"></a> </div><img src="http://feeds.feedburner.com/~r/reuters/UKBankingFinancial/~4/xP9u8_sypik" height="1" width="1" alt=""></div> Posted by Reuters