Just come across this topic rather late in the day and would add a rider. Don't assume that everyone in your old album is a family member. In our album there are quite a few pictures of people connected with the Baptist Church where my gt-grandfather and grandfather were deacons and Sunday School teachers. Clearly the church played a great part in their lives, but I've only been able to identify most of the "chapel bodies" because I also have a little illustrated booklet dating back to the late 1800s with named photos in it. Other photos show groups from work - my great-uncle with fellow millworkers barefoot by his loom, etc.
As if it wasn't hard enough to identify family members from several generations ago!

Gillg