Any current phone will do the trick.. just depends on your ecosystem pref. I personally don't like Samsung products and Android isn't my trick either. So yes, Iphone 6s is my call. Samsung might be less expensive, maybe not. Specs on the phones don't tell the truth. iOS is way more efficient with ram and the operating system is tighter. Not that security is much of an issue, but iOS is stronger and the camera is almost as good if not better, save for low light pictures.
Don't worry about megapixels, as that doesn't really matter. The optical sensor is far more important as is the iOS and what you like to use/how you like to use it.
For BF I either take pics and dump ti Imgur then post from their code, or take pics and dump to my PC via a wireless browser app then upload to Imgur. Depends on if and how much editing you need/want to do with your image once the photo is taken.
ALso, just you could just get a simple phone with text and calls, and have a decent digital camera.. usb send pics to PC, edit, and then upload to Imgur or photobucket, then post from website code.
rain today, boooo, then hot later this week YAY! Mellow monday... enjoy !