If a cacher signs the physical log in the geocache, then they may claim the find online. There is no requirement on what a Found It log has to be, so the types of logs mentioned in this thread are, unfortunately, allowable. There have been a number of the "Sent from my Moblie device" logs in the Russellville area lately. I checked one of my caches to verify that the physical log had been signed when I received the email that the online log had those words. The physical log HAD been signed, so the cacher was legitimate. However, I did follow up with the email shown below. I use this as a template to send to new cachers whenever I see a log with little or nothing provided, even for "TFTC" logs. Sometimes it is all that is needed to educate the new cacher to proper etiquette. Many times it is ignored ... even after I sent the email to the new Russellville area cacher who logs their finds, "Sent from my Moblie device", they continued to log finds that way. Then again, maybe they still don't know how to use the website to properly log the find.
Text of email:
I’m glad to see that you have found several of my caches. However, since you are a new geocacher, you may not be aware of this, but it would be so rewarding to me as a cache owner if you would spend a little more time logging about your experience in finding the caches on the website. The only benefit I get for my time and trouble in placing and maintaining a cache is the electronic log recorded on the Geocaching.com website when a geocacher finds it. "Sent from my mobile device" is the worst possible log you could write. In fact, it is down right lazy since you didn't actually write it. You just pressed a button on your phone without typing anything in. Some cache owners delete logs like that. I don't think that I will, but I would appreciate it if you would go back and revise your logs and take more time in the future when you log a find. I and other cache owners would appreciate it. It's just a matter of geocaching etiquette that you need to be aware of.
Old River Runner
"Wildness is a necessity." -- John Muir
"When you go to hide a geocache, think of the reason you are bringing people to that spot. If the only reason is for the geocache, then find a better spot." – briansnat