Based on the apparent resolution of automobiles;
And considering that you're looking straight down on people standing or walking around...
Each person, even very fat people, would take up One Pixel or less,
Which means that they would just blend into the background, lawn or street.
Occasionally; You can in fact see people, Such at Austrailia's Bimbi Beach,
But these Aerial Images were not taken by Satellites.
Google Street View is a technology featured in Google Maps and Google Earth launched in 2007.
by google map or google earth
In Google Earth v6 you drag the new orange "pegman" icon (found near the navigation controls) onto the map to enter Street View. As of Jan 2012 Google has discontinued Street View support in Google Earth 5.2 and earlier.
on Google earth but you have to download it first
Here is one of Google's announcements of ending Street View support for Google Earth versions 5.x and older. "With the most recent update to Google Earth (6.2), we are also finalizing our transition to a new method of delivering Street View imagery in Google Earth. This means, that the older versions of Google Earth (anything before 6.0) will no longer be able to access Street View. We held off making this change until now, when the vast majority of Google Earth users are on 6.0 (or later)." -- Google Jan 2012. Basically, Google decided to improve the Street View interfaces which would be implemented in the current versions of Google Earth for desktop and mobile platforms rather than keep supporting the older (less efficient) method of accessing Street View.
The aerial, satellite, and Street View imagery in Google Earth is not real-time (or live). But there is also a webcam layer integrated into Google Earth (enabled in Gallery layer) that can show "live" scenes at selected locations.
When Google updates it street view photos in its image database then these updates are made available to Google Maps and Google Earth.
Not yet for Google Earth. Google recently created historical imagery for Street View on Google Maps. If historical imagery is available then a clock and date will be displayed in the upper left of the map.
Google continuous captures street imagery in many cites around the world for Street View available in both Google Earth and Google Maps.You won't get advance notice when Google is taking pictures of a particular street unless you actually see the Google Street View car driving down the street. However, Google does provide the list of cities where Google cars are currently driving in. See related link below.
To compile Google Earth street view photos, Google send out vans with panoramic cameras. Because it was and is an huge task, some images are not up to date, but it is an ongoing process.
Google Maps from the web browser and Google Earth from the desktop can view Street View. you can also view traffic.
The typical Google Earth user would be searching for road directions, satellite pictures, street view photos, and locations, when visiting Google earth's website.