I noticed the came from stats over estimated! seeing something like 5000 visitors from facebook within hours!
I felt there is something wrong, so few researches, i found there is a reported bug with the like button where it add the parameter fb_xd_fragment into the link, this creates duplicate pages, some time indexed by search engines!
away from the SEO problem this may cause, some are saying using the iframe version of like button will solve the problem, i just replaced the like button code, and im waiting to clear my stats from previous entry to see if this really solve the problem.
I would like to know if any faced this problem before? any workaround to solve it? and if iframe version will really solve the problem?
I'll post again here if i find the iframe solve the problem