Thoughts on blogging in the classroom

At the moment, I am quite interested in using blogging in the primary classroom.  I'm thinking through the various ways blogging might be used, wondering why a teacher might choose blogging over other forms of sharing and working through some of my concerns about sharing student work and photos online in this format.
For a teacher, I believe a professional blog could be a valuable way to capture professional learning, reflect on practice and connect and share with other educators.  A blog, rather than other platforms, might make sense for this as writing is a common way to reflect.  But what about a classroom blog or student blogs?
A classroom blog seems like it could be a wonderful way to

• document student learning
• capture class memories
• show students work
• demonstrate and practice safe internet usage and digital collaboration
• or, create an authentic context for writing and sharing online.

But I work predominantly with younger students (up to Grade 2) and to make this type of format accessible to them you would use a lot of visuals.  Once you do that I begin to wonder if a visual platform like Instagram might be more appropriate, or could many of these purposes be covered using a digital portfolio tool like Seesaw.  Here are some of the questions I am weighing up as I think through using blogging as a classroom tool:
What is most accessible to parents?
What is simplest for me and my students? (One platform is simpler than trying to be on multiple platforms, so I need a clear reason to be on more than one platform)
Which platforms for sharing allow me to give most control and ownership to the students?
What about privacy of children and families?