Answer
STAFF
Sam Wierema
11-Apr-2012 04:58:24
Hi Zoey,
Our records show that we have scattered data for your account (meaning, one record on the 1st, the next on the 10th). The graph automatically tries to correct this data by calculating differences, often resulting in linear graphs (like what you've spotted).
To get more accurate data on the graph I would advise to regularly update your account using the "Update stats now" button at the top of your profile.