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I would agree with Marcus' answer on this one.

Another question as an off-shoot from this one would be: What is the performance loss in checking each request against your htaccess rules?

If the answer is none, or very little, then perhaps keeping the 301 forever isn't a bad idea at all. You never know how long people will be linking towards those 301'd pages. I personally have some pages just like this which have been redirecting visitors for as many as 5 years, because it's better to keep the link juice than to end up as 404s.

An old answer to an old question, but one which has just helped me out tremendously. A true credit to the Q&A system!

I've done this exact thing before, and overall it was a breeze. I used the following code in my HTACCESS file, and assuming you're using a standard Apache install this should work for this task nicely:

Options +FollowSymlinks
RewriteEngine on
RewriteCond %{SERVER_PORT} ^443$
RewriteRule ^(.*)$ http://www.yourdomain.com/$1 [R=301,L]

As far as SEO is concerned, this of course means that any existing links will be redirected to the HTTP version, but in my case the knock in rankings was minor at best.

Of course, make sure to update your internal links to make sure you're not redirecting unnecessarily.

I don't think there is anyone who can tell you a straight up answer to this question, not without guessing at least. Whether +1 has any effect on standard results pages is not known, and to be honest is unlikely purely because it is so easy to manipulate.

What I can confirm from my own testing is that the real ranking benefit is one as a result of personalized search. For example, you +1 an article on example.com about bananas. The next time you search for bananas, that site is more likely to appear higher in the search results for you (and possibly friends of yours).

I was under the impression that Open Graph data is completely separate from structured data, at least in the way Google is talking about.

There are quite a few examples of websites using both without any issue, for example:

http://www.telegraph.co.uk/culture/film/filmreviews/9257722/Dark-Shadows-review.html

This review features extensive Open Graph data, in addition to plenty of additional markup data, and this does not affect the rich snippets data which can be found by searching under the keywords "dark shadows review".