Pop or drop for Twitter IPO?

Popularity is a good thing, but in the case of Twitter's IPO it's starting to make some people very nervous.

Sources tell Reuters Twitter's IPO is now massively oversubscribed.

Twitter's so called road show, where management speaks with potential investors, went so well they wrapped up early after boosting the expected price range to between $23 and $25 a share.

But sources close to the situation said demand among institutional investors has been so strong, the final pricing could be even higher than that new range.

That makes S&P Capital IQ analyst Scott Kessler leery:

SOUNDBITE: SCOTT KESSLER, EQUITY ANALYST, S&P CAPITAL IQ (ENGLISH) SAYING:

"It seems like a lot of people are really kind of focused on this notion of Twitter being a global business, a global brand with a lot of growth potential and we agree with that notion. But to be valued at upwards of $20 billion potentially, without any profits at this point or we think through next year. We th