What is the best free blog/website for a primary school reconnecting group?

I recently reconnected with my primary school classmates and want to open a blog/website to put before and after pictures, bios, discussions, etc. We already have a chat group, but I want something more permanent.
Can you recommend a site that would support all the above? Most free blogs would allow me the picture and bio features, but not the discussion part. Do I need to use a plug-in or something like that?

All suggestions are welcomed. Thanks in advance for your input.