Ghost is an excellent blogging tool and happens to be free and easy to install on your Synology.

• First get node.js installed, see node.js on synology ds411 intel on how to do that. NB Synology comes with node.js V0.12 and runs just fine for Ghost.
• Next follow this official tutorial from Ghost.org
• Remember to install Ghost under /volume1 or somewhere else than /root or it will be deleted on the next DSM update
• Open/forward the port 2368 from the internet to your Synology
• Then you’ll want to run the ghost app in the background: you need to install a handy tool called screen.

ipkg install screen

Explanation on how to use screen. Obviously you can skip the installation part.