thanks for the hints, csound1. i have looked and not found anything. but, looking has gotten me thinking. i bought a new iphone in 02/15. i'm guessing that something the carrier or i did to get my data to my iphone caused the additions to my contacts.
rkaufmann87's mention of facebook settings made me go through all of my fb settings--some that i had never looked at before. i looked at apps and ads and found some of the companies listed whose info wound up on my address book. i have removed everything i can from fb. i'll see if that takes care of things. i still don't completely understand. i do understand that facebook is doing things in the background that i have not paid attention to. they are trying to make money, after all.
thanks to both of you.
ah, gee. i think i have made a mistake. i think by clicking "this helped me" to your answers will prevent me from clicking "this solved my problem" later. i'm sorry.