I'm doing mine through Instagram. I started doing one on FB last year but I gave up because it was getting too complicated to move the pics to the right folder. Instagram is much easier so that's what I'm doing this year
My problem was that I took most of the pictures on my phone so they would upload to the Mobile Photos album and I'd have to move them to my 365 album and I would often forget to take one too. I just gave up but hopefully I'll keep on it this time
I gave it a go last year but failed just after the halfway point. To do something like this ist's good to have the time to actually set up photos or go out with a plan. A few people I know are doing it this year and it seems that most of the time they are just churning out photos for the sake of completing the 365 without much thought or consideration going into their images. That was the problem I had. It might be good for motivation but it's not worth it if you're just going to produce shody images that aren't up to your normal standards.
I'm going for the much simpler 52 photos It gives me time to think about what I want from that week and most of the photos will hopefully be a plus for my porfolio because they'll be worth taking.
I'm doing one. Some of the photos I'm churning are bad, but I like being forced to take a picture every day. It's only 20 days in and I'm already taking self portraits - I hate taking photos of myself! I like how it's pushing me outside my comfort zone. So even though some of the pictures are absolute crap, I feel I'll be a better photographer in the end. Also, the failed photos often give me ideas of photos I wanna take when I'm better at it, or have a model, etc.