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Yahoo! Groups offers free mailing lists, photo & file sharing, group calendars and more. Discuss hot topics, share interests, join online communities.

Twitter is without a doubt the best way to share and discover what is happening right now.

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Google+ aims to make sharing on the web more like sharing in real life. Check out Circles, Messenger and Hangouts, just a few of the things we've been working on.

Alexa provides information about websites including Top Sites, Internet Traffic Stats and Metrics, Related Links, Online Reviews Contact Information and Search Analytics for SEM and SEO optimization. The Alexa Toolbar is a browser add-on that shows d...

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Showsiteinfo - A Free SEO tool that provides free website analysis, traffic details, rankings, contact email ,similar site, same owner site , same ip site, optimization and promotion reports.

You can check detail information about any websites including worth, popularity, traffic rank, server location and more.

From AboutUs: See what information we have on Wiki and share your knowledge.

W3Techs provides information about the usage of various types of technologies on the web.

StatsCrop - a web service that lets you explore any website informations and its history, understand your competitor