The correct use of commas seems to be disappearing. Yes, I know language is becoming more casual, but commas are probably one of the most important aspects in grammar. I found these great graphic examples on Pinterest demonstrating the importance of commas and how a sentences meaning can completely change without them. As you can see, commas can be the difference between life and death.
Really, eating Grandpa is pretty savage. One small comma saves Grandpa from a gruesome demise.
Let’s eat Grandpa.
Let’s eat, Grandpa.
I like cooking my family and my pets.
This sentence should read: I like cooking, my family, and my pets. I love the sense of humor in this example.
Lack of commas really does change the meaning of a sentence.
One of my pet peeves is newspapers trying to save ink by no longer using commas in a series as in example #2. As writers we should fight this trend every step of the way. Commas save lives!