It's a good idea to delete exif info in case you're publishing photos on Flickr/social nets/etc. You may want to hide GPS coordinates taken from a built-in receiver, or date&time, or equipment-related information. And I personally use
this batch exif remover for that purpose. The good that it lets me to selectively deal not only with exif, but also with Adobe XMP, IPTC, and other photographic metadata.