Pinterest slides after third-quarter revenue miss
** Pinterest PINS.N shares fall ~8.4% to $18.23 in extended trading after company reports third-quarter results
** Company reports revenue of $1.17 bln, missing analysts' average estimate of $1.21 bln, according to data compiled by LSEG
** PINS forecast Q4 revenue in the range of $1.43 bln to$1.48 bln, compared with estimates of $1.52 bln
** Up to last close, stock down ~23% YTD