Ideas for my project please

Hi,
I have developed a message board based rest web services. Now, i want to develop another web service charged of collecting users' actions in this forum. Can you give me some ideas for the developement of this service.

Hi!
Have you considered classifying the different actions?
For instance, categories related to message topics may be create, reply and read.
Then if you have a message topic with the id 12345, you could retrieve the creator of the topic using, for instance, http://mymessageboard.com/topics/12345/creator and the people that have replied to the topic using, for instance, http://mymessageboard.com/topics/12345/replies.
To retrieve the topics read by the user with id 45678, you could use http://mymessageboard.com/users/45678/readmessages and to retrieve unread messages http://mymessageboard.com/users/45678/unreadmessages.
Hope this will give you some new ideas.
Best wishes!