Given the market volatility over the past several years, it’s not surprising there’s a booming market in investing advice. How to sort through it all? One way is to look at what the readers themselves think. Financial Planning looked at the top seven investing advice books on Amazon, sorted by average reader reviews. At the top of the list: a book about investing in yourself (your business or brand, that is) via social media network LinkedIn, written by Wayne Breitbarth. The author’s background (aside from social media expertise) is in the office furniture business. But not all the advice is new-fangled — in second place is a classic book from the 1930s. Here’s a