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Google is fairly clever in the way it handles acronyms. ie. If you type "PPC" into Google, as well as "PPC" it will also highlight "Pay Per Click" whenever that shows up in the search listings. Vice versa the same is true.
BUT, why is this not always the case. Try searching on "pay per click" and looking at the results in the first few pages. "Pay per click" is always highlighted, but PPC is only sometimes highlighted. Why is this?
Can something be changed within the site or meta tags to ensure that the acronym will be highlghted in your snippet?
For any such highlighting (bolding) to occur, Google must have established a semantic equivalence between the acronym and its expansion. That certainly is not the case with all acronyms, but it is for "PPC".
The main exceptions I see to expected bolding occur in two places:
1. The short, inline sitelinks are not bolding "PPC" in the anchor text.
2. For the related searches at the bottom of the page, I see the REST of the anchor text in bold, and not the search terms.
I wonder if using one of these within the body text of the page will help to get the acronym highlighted?