December is a time for reflection, especially when it comes to your finances. The expensive holiday season -- think gifts, party outfits, and festive drinks -- means you're probably thinking about how to stick to a budget and keep costs down in 2014. It's also a time to reflect on mistakes, which is why I've rounded up the top personal finance fails of 2014. The purchases that made me cringe, the examples of internet over-sharing that made me wonder how someone's identity wasn't stolen sooner. All so you can avoid their mistakes in 2015.