I recently changed URLs of Go4Expert to Section based urls and was really surprised to see that Google+ merges +1′s of old and new URLs for 301 permanent redirects where as Facebook and twitter does not do anything about it.

Facebook Likes to Old URL

Facebook Likes to New URL
Google+ is really smart

Facebook Likes, Tweets and +1′s to new URL
suggesting it has better chance of impacting the search results. What are your thoughts on the same?
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Similar thing happened on my recipe blog.