Anything online can be stolen or misused. Don't trust anyone if that's a concern for you.
Despite the changes flickr made that I'm really upset about, it is still a good place to put some photos you want to share. I use it to put up images that I use at LFPF or share with friends. If you use descriptions and tags, you can also learn a lot how other people use a piece of equipment, developer, film, location, camera, etc... I like following other photographers with related artistic interests as well. It's a big dose of creativity anytime I feel like it.
This is still a good place to financially support even if you don't put up photos. It's probably less $ than a tv channel you like if it were possible to buy channels al le carte.