posted by Tom .
Is there a difference if you say where you live by saying "Yo vivo en Florida" or "Vivo in Florida." I don't get why they say the Yo sometimes and not the other times
It would be "en Florida" in both cases.
The Yo is not necessary, but might be added for emphasis, if many people are saying where they live, or if the speaker is particularly proud of living in Florida.
The reason it is not necessary to state the "yo" is because the ending of the verb says it is "yo" as the subject. vivo = It's the personal ending of "o" that goes with "yo."