I wouldn't give much credence to commercial content sites like sfgate...I have a ton of articles on there (and eleswhere online) and I had no clue what I was talking about and nor did their content "editors". That's one of dozens of sites owned by Demand Media, who hired any semi-literate chimp who would churn out articles for them. They really don't care about accuracy, just money. Which can be considerable.
I know because I wrote for them for about seven years. And they rule Google's algorathims, and appear on the first page of many online searches but it's mostly complete armchair amateurs writing for these sites for money. (I was one!) lol.
Which is not to say content sites like this aren't right some of the time but this is NOT an authoritative source of information.
That said Chucks advice is usually spot on correct.