I wish Google hadn't made the decision they have: the apostrophes are just going to encourage more people to use them where you don't need them, and confuse everybody.
How to spell +1′d (or is it +1ed?)
http://motivatedgrammar.wordpress.com/2011/07/08/how-to-spell-1d-or-is-it-1ed/
How to spell +1′d (or is it +1ed?)
http://motivatedgrammar.wordpress.com/2011/07/08/how-to-spell-1d-or-is-it-1ed/
