I do my best not to criticize other people’s grammar, but if you’re a corporation, you should get it right. I just clicked the +1 button on an article and got told that I “publicly +1’d” the article. Is that correct? Or is like all the signs that say “CD’s”? I’m unsure. The apostrophe means that it is a contraction, i.e., something is missing. Is “+1’d” a contraction of “plus oned”? Or should it have been “+1ed”? Google should have picked a less awkward name for its like button.