I think anyone who checks in at airports or post offices or banks may see the tip and possibly...just possibly... come here to enter them...
So here starts experiment Day 1: Tip entered at Newcastle Airport

Just sent you a requestCrazy Bob wrote:I have just created an account, aptly named Crazy Bob. Feel free to add... (let's see what Foursquare is)
https://foursquare.com/user/47082048" onclick="window.open(this.href);return false;