IAC/InterActiveCorp, Barry Diller's internet conglomerate, on Monday agreed to buy Ask Jeeves, the search website, in an all-shares deal worth $1.85bn as it seeks to capture a larger share of online advertising and search markets.

Ask Jeeves leavens IAC's heavy portfolio of travel and e-commerce sites, including brands such as Expedia, the travel website, and HSN, the home shopping network.