FriendFinder - one of the largest and comfortable community for people seeking love, friendship, marriage, short-terms relationship. Friendfinder combines some of the best features of a social networking site and a dating service, making it a hub of activity for mingling and getting to know other people. To find your match, FriendFinder offer several powerful features, that allow you to narrow your search so you can find exactly the kind of person you, are looking for.
Database: over 1,300,000 Active Members.
Geographical region covered: International.

eHarmony was launched in the United States in 2000 and is now the #1 Trusted Relationship Services Provider in the USA. eHarmony’s patented Compatibility Matching System® allows eHarmony members to be matched with compatible persons with whom they are likely to enjoy a long-term relationship. Traditional Internet dating can be challenging for those singles looking for love that lasts. But eHarmony is not a traditional dating site. Of all the single men or women you may meet online, very few will be compatible with you specifically, and it can be difficult to determine the level of compatibility of a potential partner through methods of conventional dating services – browsing classified ads, online personals, or viewing profile photos. Our Compatibility Matching System does the work for you by narrowing the field from thousands of single prospects to match you with a select group of compatible matches with whom you can build a quality relationship.

Meetic is an international dating site that has single members worldwide. It is Online dating service that focuses mainly on international users, and offers them a very user-friendly format. They claim to be partnered with more than 50 partners including TV stations, newspapers, etc. They also claim to be the leading dating site in Europe and one of the largest dating sites worldwide. Over 22 million members including single mean and mail order brides are reported to have registered. There is also a section regarding successful relationships that are a result of meeting there.
Data base: users from over than 20 countries.
Geographic Regions covered:  International.

 Lavalife is a unique online dating and online personals service. LavaLife boasts millions of members and thousands of successful matches.  Three community: Dating, relationship, intimate community with three different profiles saved searches.
Services: Create a Profile, Upload Photos, Upload Videos Free chat, instant messages, smiles, emails, Reply to Messages, Subscribers get access to unlimited instant messages, unlimited emails.
Data base: 8 million registered members.
Search engine: Country, state/province, city; Online activity.

Date dot com slogan – Every relationship begins with a date. Date have more than two million male and female members worldwide who actively use the site because it offers a convenient and safe way for singles to meet. You might wonder why someone would choose to pay a fee to communicate with other singles on the net when there are so many chat rooms online where you can talk for free.  It's because of the quality of their members. Singles who subscribe to Date.com are professional, educated, and are serious about finding a healthy, happy relationship.
Data base: About 2 million active members - USA, Canada, United Kingdom, Australia, International.

Cherry Blossoms is the company that started the business of helping single men and women meet for love and marriage over 30 years ago and has been successfully helping singles meet by publishing their picture personal ads since

Database: 75000 profiles from U.S., Ukraine, Philippines, China, Singapore, Germany, Hong Kong, Indonesia, Malaysia, South America, Europe, Belarus, Thailand, Russia, Australia, New Zealand and many other countries.

Services: Visa service

With more than 15 million members, Match dot com is one of the largest general interest dating sites on the Internet and one of the most successful at bringing people together. The staff at Match.com calculates that every year more than 200,000 people find the person they were seeking by using Match.com. And Match reports that people 50 and older represent its fastest growing user segment.
Services: Creating profile, posting photos, sending winks – free of charge Instant messaging, match mobile, member spotlight, windows live alerts.
Special features:  Differnet Match Communities, Guarantee program - If you don’t find someone special during your initial 6-month subscription, Match gives you an additional 6 months at no additional cost to you to continue your search. 
Data base: Over 15 million members.

Matchmaker aligns members into one of several demographic or geographic communities, with only limited communication between members of different communities. Data base Over 8 million singles.
Services: Send e-mails and instant messages; 
Special features: Video Webcam Chat, Hot List of favorite contacts, “become invisible”, block specific members.
Search engine features: Basic, advanced and quick searches, saved searches
Search catagories:  online now/ last visited/ Who’s new/ Featured members/ Who’s on IM/ I viewed/ Viewed me.

Mingles is a free online dating community where you can make new friends, find romance, form groups and blogs, chat with people from all over the globe, join social networking and basically just have lots of fun.
Data base: about 1,000, 000 heterosexual, single, widowed, divorced, or separated men seeking women or women seeking men.
Geographic Regions covered: worldwide.

Mate1 is the intimate dating site, with millions of members in the U.S. and worldwide.
Geographic Regions covered: USA, Canada, World-wide.
Data base: About 15 million users.
Services:  Voice messages, video messages, winks, sening email, meassage boards, email notifications, romance tours of introduction, instant messaging, chat, blogs.