My site has been running for about 8 years. I currently use this format for displaying a particular testimonial:
But recently I've wondered if I should switch to a format like this using mod_rewrite:
Is there good evidence to suggest this kind of format is preferred by the search engines? Would this ruin any SEO ranking that I may have built up for each page over the years? What about Facebook? If many people have liked my pages with the existing format, would I have to start over with building up the total number of likes if I change to the new URL format?
Can anyone offer some advice that has gone through this before?