Zarrata.com

these are some

43 Things – A tagging based social networking site. Users create accounts and list a number of goals or hopes and these are parsed based on similarity to goals of other users.

Amitize.com – Amitize is a worldwide friendship network.

aSmallWorld – aSmallWorld is a private online community designed for individuals who would like to connect, re-connect to share similar thoughts with each other.

Badoo.Com – Badoo is a dynamic multi-lingual social networking site with innovative photo and video features that allows its users worldwide to gain an instant mass audience and interact both locally and globally.

Bebo – Bebo is a hugely popular site (especially in the UK), and similar in philosophy to MySpace. It allows users to communicate with their friends in multiple ways including blogging, sending messages and posting pictures.

Eons – An online gathering place for the elderly; most of the users are over the age of 50 years.

Facebook.com – Facebook is a social networking phenomenon connection people with their friends, family and other users with similar interests.

Faceparty – A UK based community social networking website. It started for youngsters but has now risen to popularity among all age groups.

Flingr – Flingr allows users to connect with all categories of friends – colleagues, college mates and school buddies.

Friendster – It is a popular global social network for finding new friends and developing friendships as well as searching old friends.

hi5 – Hi5 is a prominent social networking service in India with over 40 million users. However, Hi5 has recently experienced an upsurge beyond India and has shown increasing popularity in EU too.

Lovento – Lovento allows you to discover news friends and also find information about latest events.

Best one.