Online company AOL Inc. is buying online news hub Huffington Post in a $315 million deal that represents a bold bet on the future of online news.

The acquisition announced early Monday puts a high-profile exclamation mark on a series of acquisitions and strategic moves engineered by AOL CEO Tim Armstrong in an effort to reshape a fallen Internet icon. AOL was once the king of dial-up online access known for its ubiquitous CD-ROMs and "You've got mail" greeting in its inboxes.