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This is my site

http://askintamil.com/

2 days before there was Facebook login button now it is missing..

also when there was facebook login, could not logout ,it took to "Not Found Page"

http://askintamil.com/&redirect_to=http://askintamil.com/

also, in WP-admin

in the left side i could see Wp-answer for plugin setting,

but i couldnot do any settings, when i click it, its logging out automatically

what might be the problem , i also tried by re-installing the plugins