Consumer darlings Apple and Google are starting to flag when it comes to customer satisfaction, according to a new survey. 

The latest American Customer Satisfaction Index (ACSI), published by the University of Michigan, will be released today.
According to the Mercury News, Apple's rating fell from an 83 last year to a 79, while Google dropped from an 81 to a 78.
Conversely, Yahoo's score increased from 76 to 79.
Companies are graded on a 100-point scale following a national survey. Apparently, a change of two or more points is statistically significant.
The ACSI has consistently predicted future consumer spending and is an indicator of financial performance at both the company and industry level.