Video on
msnbc.com: Brian
Wieser, Pivotal
Group Research
analyst,
downgraded
Twitter's
stock. Wieser says
he doesn't
think
Twitter's pr
(more)
Video on msnbc.com: Brian Wieser, Pivotal Group Research analyst, downgraded Twitter's stock. Wieser says he doesn't think Twitter's product is for everyone.