If you are are richly blessed to go through and make decisions about old family photos, please remember those unnamed ones in pics may be ancestors of your friends and kin, who have nothing quite like those photos. It's pretty simple: before you trash them, just pass them on to someone who would care.
Somehow, I see this "holding of photos" as a sacred trust. It is very important to do the right thing. In families there are people who emerge as story tellers or the keepers of the stories. These are great folks with whom to discuss distribution of photos and with whom to share these lovely leaves of the past.
This is a fast paced, throw away society. Some things just do not fit that mold.