MFP is My Fitness Pal. It's a website that you can use to keep track of calories, like an online food diary. There's also a forum and challenges and similar stuff that you'll find here. A lot of people don't find it as supportive as 3FC is. I primarily use it to track calories but have started to sign up for challenges as I'm finding 3FC to be less active than it used to be.
SeeMyFeet- it's up to you whether your diary either food or exercise is open or not. You can set it to complete private so you're the only one who can see it, you can set it so that only your friends can see it or you can have it open so that anyone can see it. It's entirely up to you. I've got a bunch of excel files too, including one for my diet, however I like it because it's got a huge database of food. If you're not entirely sure of the calorie content of an item it likely has it. It even has a ton of the Korean food that I eat on a regular basis that I wouldn't be able to guess what the nutritional content was.
I finished yesterday at 1652 and according to fitbit I burned 2224. I'd like to keep my difference above 500 so I hit that goal. I'm going to try and stick to a healthy diet today however I know I'm going to have an extra drink or two tonight, hopefully I don't do too much damage!
Hope everyone has a great New Years Eve.