Some mobile apps will match you with people based on criteria, including age, gender, and geographic proximity.
Zoosk is a singles dating app that uses a behavioral matchmaking engine to pair users who its system indicates will be a good match.
Examples within this category include Jdate for Jewish singles, Geek2Geek and Farmersonly for farmers and the people who want to meet them.
A 2013 study shows that nearly 60% of all new marriages in the USA started with the couple meeting online.
Depending on the dating site, all other members might be able to see your profile and message you.
Check to see what safeguards are put in place by the site, and which ones you can enable to limit those who sees your profile.