If anyone can shed light on this, I'd appreciate it!

When I get points each day, they include ones for my "pictures and/or actions on the site" (think that's what it says). I don't post photos each day, so I'm wondering if anyone knows what actions net you points. I have been here since the end of May, and I really have no idea! Some days, I only have about 16, another 54....

Thanks!