Not to be pedantic but Snapchat is actually from LA and they're very proud of this fact. In the VC context, they did take money from (Silicon Valley) VCs, but their origins and workforce isn't from SV.
(Of course, being equally pedantic about other Silicon Valley companies - Facebook, Reddit, Dropbox, and YCombinator all "started" in Boston, and the critical events in both AirBnB & Twitter's history happened at SXSW in Austin.)