It really is more functional to just host your photos someplace else, all together, and then link to them when you want to post on a forum or whatever. Flickr is nice, but if you use it a lot it costs like $20 a year; Picasa (Google's service) is free I think, but probably has some other limitations. Either one is easy to use and then you have control over your photos.
Also, depending on what software you use to manage photos on your computer, you can often upload right to these services from that software. I use iPhoto (in macOS) for my day-to-day photo stuff and it works great for this.
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