Not because my photos are in anyway professional, but because of the wonderful things Flickr does. Flickr allows me to store and organise my photos. I can look at pictures by friends, acquaintances and all sorts of groups.
Most importantly Flickr curates and organises creative commons licensed and public domain photos. These are searchable and Flickr give access to them via an API that is useful and usable by non-professionals. I’ve had an amazing amount of fun and use (professionally as a teacher). To me Flickr is an important part of the web, I have a pro account to support that.
If you use Flickr and don’t have a pro account you can get 25% off with the code 25in2019 or use this link.