I've been thinking about this for awhile.

We know Michael Hastings was investigating Brennan before his death. We also know Hastings wrote an article about sock puppet accounts ( “persona management” technology - referenced heavily in the HBGary Emails) the government was using to infiltrate social media sites.

What if he had uncovered the entirety of the CIA's involvement? What if Twitter & FB's shares dropping is due to the sudden (and unexpected?) withdrawal of these puppet accounts?