That dash of market analysis on Twitter wasn’t an impromptu thought from an investor. It was a prewritten post, taken from a library of 140-character messages that had been approved by the compliance department of Morgan Stanley and sent out by financial advisers at Morgan Stanley Smith Barney. This article was written by William Alden.
http://dealbook.nytimes.com/2012/03/21/on-wall-st-keeping-a-tight-rein-on-twitter/?scp=50&sq=marketing&st=cse