My Take
Padlet is very simple to use, for both the setup and implementation with students. Our school district uses Schoology, and embedding a Padlet page into Schoology couldn't be easier. It can also be used as a link to share, so access to it is very easy. I love that my students don't have to have accounts to use it, and it's a great way to hold a back channel to have classes share their thinking.
How I Use It
Padlet is great for gathering quick feedback in a bulletin board type format. Students can share their thinking, as well as teachers sharing thoughts or questions to get everyone thinking and "talking". This tool can be used in any classroom situation and any content area. I would use this with older elementary, middle and high school students.