We have certain check-in controls implemented. If Foursquare thinks that you're checking in more times than seems reasonable, we will show you this message. If you're consistently checking into a bunch of venues in a short period of time (or a lot of venues in a 24-hour period), we won't award you points, badges, or mayorships for the check-ins that exceed our limits. It's ok to check in at home, at work, at the coffee, shop, at a park, at the train station, at a restaurant, picking up your dry cleaning, but if we see you checking in at every venue you walk by, you won't get credit for those check-ins. No drive-by or walk-by check-ins, please! Keep your check-ins legit and you won't run into this message.