SAN FRANCISCO (AP) — Yahoo is turning its U.S. website into an outlet for bargain hunter Groupon and more than a dozen other similar services.

The partnerships announced Tuesday are the latest in a series of alliances that Yahoo Inc. has forged in the past 18 months with other Internet companies. It’s part of an effort to keep people on Yahoo’s website for longer periods and bring in more ad revenue after years of listlessness.

The turnaround efforts haven’t paid off yet, leaving Yahoo vulnerable to a possible takeover attempt.

Yahoo is currently testing offers of local business deals from Groupon and other partners in various U.S. cities.

The Groupon partnership comes amid speculation that Yahoo had been negotiating to buy the discount service for $3 billion. A Yahoo executive declined to comment Tuesday.

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