There are tons of free tools available over the internet and recently while working on marketing research for my own venture I chanced upon this cool tool by Google. It is called Google Trends.
Google Trends allows you to search the most popular searches happening within a specific territory. You could further drill it down to show the trends revolving around certain subjects of interest.
This tool keeps you up to date of what is happening in the market real time. Use it to respond immediately to market changes.
Try Goog