One in 10 American adults has tried online dating, and nearly 60 percent of Internet users say it is a good way to meet people.
Yet some researchers say dating companies' matchmaking algorithms are no better than chance at providing suitable partners.
At the same time, critics worry that the abundance of prospective dates available online is undermining relationships.
Scammers, meanwhile, are using datingsites to extract money from vulnerable targets, and some dating-site users advise caution about maintaining personal safety.
Melissa Ellard, a fashion entrepreneur in Foxborough, Mass., says she would have been dateless for several months last year if not for Hinge, one of a number of new, increasingly popular mobile dating apps.