eHarmony.com
Founded: 1998
"See why eHarmony.com is the fastest growing relationship site on the web. Take the eHarmony Personality Profile and get instant, objective feedback on yourself and how you relate to others. The eHarmony Personality Profile begins the exciting journey toward finding your true love."
Why Not Start Now?
It’s risk free, so there’s nothing to lose.

Date.com
Founded: 1997
Members: Over 2 million
You can browse the site and post a profile, including a photograph, for free. However, as a registered member you can send unlimited email to other members, get top listing in the search results so your ad gets noticed more. In addition, you have access to chat rooms and the Advanced Search and AutoMatch feature.

The main service is for straight relationships, but there are also sections for gay and lesbian members.

AmericanSingles.com
Founded: 1997
AmericanSingles.com has over 10 million members and 10,000 joining daily. We have free memberships, detailed profiles, photos, chat and more. It is the place for singles to comfortably meet and find REAL ROMANCE.

Metrodate.com
Metro Date offers a free membership, which includes an ad, search and chat.
Free to place your personal ad with up to 3 pictures. First contact is free.
Become a paid member to send messages, free to reply, earn extra contact tokens when you include your picture with your personal ad.
Chat rooms, forums, advice and compatibility matches available.
Straight and same sex personal ads.

Mingles.com
Founded: 1997
Members: Thousands
Mingles is more than just a dating site. It is a community with parties, message boards, and an exclusive PhotoChat - the chat that lets you see who you're chatting with.

Basic membership is FREE, however, by joining you will get to search using very precise criteria, use the powerful meet and mingle features, create your own profile, use the PhotoChat rooms and forums, create member hotlists, and much more.