I use an app called photo squarer, that adds a border on the top and bottom of a 3x2 photo to fit the square format of instagram that way I don't have to crop my photos. It is easy enough to do in photoshop, just using making a 600x600px workspace, but it's way easier just having my phone add the borders and I don't have to worry about centering everything. It wasn't for a while, but lately IG has been one of my favorite social media outlets to share my photos. I have roughly the same amount of followers on IG as likes of my photo page on FB, but unlike facebook I know when I upload a photo ALL of my IG followers will see it (at least if they check their phones). Plus, with the hashtags I get to reach a ton of people who may otherwise never see my work.
The other thing I like about instagram is that I will share things on there that I may not share on my facebook page, like behind the scenes type photos that I've found my audience really enjoys. Just simple stuff like a cell phone photo of my tripod/camera set up at a new spot, showing where I'm shooting that day. It gives them a reason to check back at my final result and brings some more activity to my IG feed. Like I said it's actually turned into a pretty useful business tool and I've gotten work with a few companies through IG, so don't underestimate it.