For anyone considering the flu shot this year, you might ask your medical provider if they are offering the trivalent or quadrivalent immunization. The typical standard for years has been trivalent, but this year the 4-virus immunization is available (2 type-A and 2 type B virus protection). In contrast, the trivalent protects against only 3 flu viruses. If you're going through the pain of a shot, you might as well get the most bang for the buck.
As to web sites offering information about any concerns, look at the domain - it it is a .com, then it is a "commercial" site, and the information may or may not be reliable. Personally, if I'm looking formation that is health related, I'll focus on the .edu and .gov domains, particularly NIH (National Institute of Health) and NSF (National Science Foundation) for reliable information.
One other thing - I'm almost 60, and have had the "real flu" two times in my life - once nearly claiming my life. What the general public often think is flu, is actually nothing more than a common bad cold - real influenza is a virus that will take you down for a week, and make you think you are going to die, which you might. For instance, the flu of 1918-1919 - 20-40% of the world became ill, 50 million died of which 675,000 were in the USA. It is thought to have first struck in Fort Riley, Kansas, an Army base in the Midwest. One of these years, a highly virulent strain like this (or worse) will likely happen.
Personally, I wouldn't go a single season without immunization.