Other parents have developed online directories.
Gohalal.co.uk is one of many online directories allowing Muslims in Britain to search for restaurants that comply with sharia law.
You can identify these in the online directories of the Board for Certification of Genealogists or Association of Professional Genealogists.
Other sources are state medical societies and local hospitals, most of which have online directories of doctors.
One of the fund's strongest performers was Switchboard, in Westborough, Mass., which provides Internet yellow pages and other online directories.
Although their structure mimics the conventional fair, they can vary," says Allmond. "Some can resemble ordinary online directories, while others offer sophisticated 3D-based technology".
Using I.D. photos of female undergraduates scraped from the university's online directories, Facemash presented users with pairs of women and asked them to rank who was "hotter".
Dean McEvoy, BookingAngel's chief executive, said online directories were more likely to use his service because it charges businesses a per-booking charge rather than a subscription fee.
He can see, for example, that much of the traffic to his site comes from online directories that list architects and designers, like HGTV.com and ThisOldHouse.com.com
Next up for her company, she added, will be something like online directories of authors' Web sites, whether started by writers, publishers or fans.
It can be one that students are familiar with already, or students may search by country at one of several online directories that list colleges and universities around the world.
