It sounds like a stupid answer, but start with a subject you are interested in. If you are interested in a subject, there is a better chance of maintaining interest in the research.
Bacon, everybody loves it!
How about Democracy in Schools as a topic?
Romance cars
Best way if your not familiar with the topic or how to write an editorial is software that will do it for you.
There is no best topic regarding social issues. It really depends on what that writer feels is the best thing to write about.
The topic of article 2 in the constitution is about the Executive branch.
Write in your own way. Choose a topic most people would like to discuss. Ask people around you about how do they feel about what you write.
globe warming or the human body your decision
The website ilovetoknow.com has a excellent article on this topic. The article in entitled "How to Lose Water Weight Quickly". In this article you will find step by step instructions on the best way to lose water weight.
When writing a paper and thinking of a topic to write about, it is important for there to be clues in the title or opening statement, so the reader knows what they are about to read. A clue you can add would be a definition of the topic you are writing about.
the moon
However long you decide to write the article will be the length of the article you write.