Thank you for let me know. vs Thank you for letting me know.

Some examples from the web:

• Thank you for let... Jake, the overwhelming time pressure.
• Well I'd appreciate it if you'd let me know when you make contact with her, thank you.
• Thanks. You gents ever want to come down to the Savoy, let me know.
• Thank you so much for let me stay here, Elliot.
• When you decide what, let me know.
• If you see something lucky around here, you let me know.
• If you get any other ideas, let me know.
• If there's more, let me know.
• Anything else, let me know.
• When you find out, let me know.
• If you do hear anything, let me know.
• If anybody gets sick, you let me know.
• Any time you're uncomfortable, you just let me know.
• Things change, you let me know.
• Anybody bothers you, let me know.
• If something sounds strange, inconsistent, you let me know.
• Any unidentified movement here, you let me know.
• If I can help with anything please let me know.
• Once you've ID'd them, let me know.
• When you have an answer, let me know.

Some examples from the web:

• Thank you for letting me know.
• Thank you for letting me know.
• Yes, thank you for letting me know.
• Well thank you for letting me know.
• And thank you for letting me know about Megan.
• Mr Blokland, if at some time the Dutch booth was unable to follow me, thank you very much for letting me know.
• Rusty, thanks for letting me know.
• All right, thanks for letting me know.
• So thank you for letting me know that I need to keep a better eye on him.
• "Well, thank you for letting me know," I said.
• Thank you for letting me know your diplomas and qualifications
• I want to, but I've got a test to study for, So thanks, Amy, thanks for letting me know.
• Thank you for letting me know and for driving all the way over here to tell me.
• I had to, you know, thank you for letting me take you dancing the other night.
• Thank you for letting me have them at the wedding.
• Thank you for letting me return to the office.
• Thank you for letting me be myself.
• Thank you for letting me take home the centerpiece.
• Thank you for letting me see the finished product.
• Thank you for letting me stay.