The mobile ad network AdMob has raised USD $12.5 million in a further round of venture funding.
The new investment is its third round of funding, which now totals USD $28.2 million.
Chief executive Omar Hamoui said the new funds will be used to make investments to ensure AdMob comes out of this "challenging economic environment" in a strong position.
The San Mateo, California-based company has made a number of announcements recently.
These include offering, first iPhone-customized ads and metrics, and then earlier this week a similar service for Google’s Android smartphone.
The new funding comes from Draper Fisher Jurvetson.