One of the blogging activities that I often suggest in my workshops is having students record and share on-the-spot observations during field trips. To do this your students should have a mobile blogging application on their iOS and Android devices. If your students dont have iOS or Android devices if they have a mobile device that has a web browser or email client they can post via email to Blogger. Heres a short run-down of mobile blogging options on the blog platforms that I usually recommend to teachers.
via Free Technology for Teachers: A Short Guide to Mobile Blogging Apps for Students and Teachers.