In reply to balmybaldwin:
> Just created an instagram account and that appears to not allow me to upload from a PC (I may be doing something wrong - all it offers me is the option to follow people)
Well, you're supposed to do the pentagram pics using the mobile apps (iOS or Android), not from your computer... That said, there are plugins e.g. for Lightroom to publish into pentagram.
And I use mainly instagram for pics.
For better pics, and "photoblogs", I use VSCO (again, mobile app, but I think they now also have an actual PC upload webpage as well). VSCO is rather handy, as I can often simply edit the pics (using the app) on the go on a tablet (or even phone) and write a blog at the same time... Have done this a few times (but certainly not every time).
500px is also an option, that I'm considering at using in the future (offers possibility of selling pics, if you wish).