If you ever wonder how they gather data to publish on their sites, Personal photos and imges. I saw site update daily content I will mention category wise so you will get pritty good idea. 
1. Porn site
2. Imges Site 
3. Sotry Sites 

1. Do you guys ever wonder how they collect data to publihsed daily new porn videos? 

Ans: May be there are stolen from moibles via hacking thries phones. There are posbilites that by shareing the contnet person to person. 

2. Images sites also they update daily desi nude imges of big boobs