Useful, but be warned that it can be expensive

I can’t believe how much power you get from this one plugin. In just half an hour I enabled facebook and twitter login to my site. Very impressed, and very grateful.

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Update: I just dropped this from five stars. It turns out you are limited to 2,500 users on the free package, but there is nothing in the plugin description or FAQs to suggest plugin users will ever have to pay. It seems that the plugin authors are trying to trap people: once a site is reliant on social logins and registrations using this plugin, and once the site is successful (more than 2,500 users), the trap is sprung, and the user is (practically) forced to pay. If only the plugin was open about their freemium business model, I would put it back up to five stars.