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Online dating services also differ widely in their revenue streams.

Some sites are completely free and depend on advertising for revenue.

Under this metaphor, members of a given service can both "shop" for potential relationship partners and "sell" themselves in hopes of finding a successful match.

Such sites earn revenue from a mix of advertising and sale of additional options.

Call friends and family as often as you want, for as long as you want.

Free international voice and video calls make it easy to stay connected.

Members can constrain their interactions to the online space, or they can arrange a date to meet in person.

A great diversity of online dating services currently exists (see Comparison of online dating services).

Some have a broad membership base of diverse users looking for many different types of relationships.