"worth putting a terrier on it every time"
As an American, I have never heard that phrase, but I like it! A terrier is a type of dog that is good at hunting and finding things. Basically, he is saying that you can learn a lot by searching the web, so it is worth putting effort or time into searching the web - it is worth putting a terrier (a dog that is good at searching) on it. Not literally, of course.
"Little beats visiting people."
That simply means that meeting people face to face is the best way to engage them, rather than calling or emailing. That is, when you can afford it - when you can afford to travel to meet them.
Little = Not much
beats = is better than
Little beats visiting people = Not much is better than visiting people.