I went to https://glbse.com/ and see it is closed. It was a stock exchange for shares of companies denominated in Bitcoins.
Does anyone know why it closed?
It appears that Nefario, the person operating GLBSE, decided to go against all bylaws and terms of service and just close GLBSE. That part of the story was explained by theymos. It it still unclear, however, why he did it.
At this point in time only one person, Nefario, knows for sure why GLBSE closed. He was the one who had the power to close it, and he did so, without giving any public explanation.
Everything else is either hearsay or speculation.
Nefario's official reason for closing GLBSE was 1) AML 2) Tax 3) Regulation and he made it clear other shareholder's had no say in the site closing down.