Follow the Twitter feed to fat returns - FT.com:
"It was labelled “probably the most expensive tweet ever”. In just 21 words, US presidential hopeful Hillary Clinton’s pledge on Twitter, the microblogging platform, to tackle “outrageous” price manipulation by drugmakers wiped $15bn off the value of pharmaceutical stocks last September.
It was not the first time a social media post had a big impact on markets. A bogus tweet about an explosion at the White House rapidly stripped up to $90bn off the value of US stocks, although markets recovered quickly when it became apparent the information was false."
'via Blog this'
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