NEW YORK (Reuters) - Wall Street's advice to investors battered by plunging markets: Keep buying stocks. (http://feeds.feedburner.com/~ff/reuters/topNews?d=yIl2AUoC8zA) (http://feeds.feedburner.com/~ff/reuters/topNews?i=dlMSqnRM3xE:9YLtQJq3s7g:V_sGLiPBpWU) (http://feeds.feedburner.com/~ff/reuters/topNews?i=dlMSqnRM3xE:9YLtQJq3s7g:-BTjWOF_DHI) (http://feeds.feedburner.com/~r/reuters/topNews/~4/dlMSqnRM3xE)