Top 5 E-commerce Highlights from Q1:

1) 5.5% of retail purchases were made online.
2) E-commerce spending in Q1 amounted to $58B+.
3) $5.9B worth of e-commerce transactions were made on tablets or smartphones (source: comScore Inc).
4) E-commerce spending was 15.3% higher than Q1 2012 (not adjusted for seasonality).
5) E-commerce spending was 18.9% lower than Q4 2012 (not adjusted for seasonality).

From the article:

U.S. e-commerce sales totaled $58.0 billion in the first quarter, up 15.3% from $50.3 billion in the first quarter of 2012, according to an estimate released today by the U.S. Commerce Department.

The estimate, not adjusted for seasonality, says e-commerce accounted for 5.5% of total retail spending in the quarter, up from 4.9% a year ago. The Commerce Department includes purchases made from both PCs and mobile devices such as smartphones and tablets in its estimates. When excluding sales in categories that are rarely bought online—such as automobiles and fuel—Internet Retailer calculates that e-commerce accounted for 8.2% of total retail sales in the quarter, up from 7.3% in Q1 2012.