Most services also encourage members to add photos or videos to their profile.
Once a profile has been created, members can view the profiles of other members of the service, using the visible profile information to decide whether or not to initiate contact.
Nevertheless, only one in three had actually gone out on a date with someone they met online.
About one in five, especially women, at 30%, compared to 16% for men, asked for help with their online profile.
In addition, online daters felt that online dating is easier more efficient than other methods (61%), and gives access to a larger pool of potential partners (62%), compared to 44% and 50% of non-users, respectively.
Meanwhile, 60% of non-users thought that online dating was a more dangerous way of meeting people and 24% deemed people who dated online were desperate, compared to 45% and 16% of online daters, respectively.
80% of the users said that online dating sites are a good way to meet potential partners, compared to 55% of non-users.
In particular, the number of American adults who had used an online dating site went from 9% in 2013 to 12% in 2015 while those who used an online dating software application on their mobile phones jumped from 3% to 9% during the same period.
This increase was driven mainly by people aged 18 to 24, for whom usage almost tripled.
Some sites are completely free and depend on advertising for revenue.
Others utilize the freemium revenue model, offering free registration and use, with optional, paid, premium services.