i always clear my personal logs so i can easily see if someone just hacked into me or not
nahh, leave something there. at least one log thing. a lot of people seem to have the habit of deleting everything in a log. leaving something there will let you know if that happened
even better, you could leave it seemingly empty, but include a specific number of spaces, like five or six or so, and that way even the people who only delete their own log entries would most likely get rid of your spaces