To Blog or Not to Blog?

While this blog is dedicated to the idea of blogging and its usefulness, I'd like to plan another blog or website based on a more elaborate topic to investigate.

Here is a list of possible Blog/Site topics:

• Investigating Speculation's effect on the Market
• Investigating Goldman Sachs ability to sway the market with an opinion (despite a terrible track record)
• Awareness of Carbon footprint reduction based on green energy technology
• Investigating the ever expanding application market and its profitability
• Investigating the future of video games and virtual gaming
• Investigating the effect of the internet on introverted children and young adults
• " " on obese children

These are a few topics,  I love the idea of speculation as it's such a hot topic that is being overlooked by many but I also really like the idea of investigating the "App" Market that is proving much more profitable than anyone had anticipated.  If I weren't able to do either of those I would chose the affect of the internet and house-ridden  children;  I believe unless there is rule of moderation in place that people and children of the future will become more and more introverted with more poorly developed social skills.  I believe there are quite a few psychological studies already that I may look into. 

Right now, for the "Final topic"  I will assume it will be the investigation of the affect speculation has on the market.