Some statistics on blogs by the people who host them-
1) Tumblr
12,917,771,050 TOTAL POSTS
34,669,313 TOTAL BLOGS
42,559,168 POSTS TODAY
2) WordPress
66,286,719 WordPress Sites in the World
I found no stats by Blogger or by Drupal but by using Google Trends.
From Google Trends-
| blogger |
|
3.00 |
| drupal |
|
1.00 |
| sharepoint |
|
2.20 |
| wordpress |
|
3.6 |
| tumblr |
|
2.20 |
DECISION STATS 