I see that you are not currently registered on our forum. It only takes a second, and you can even login with your Facebook! If you would like to register now, pease click here: Register
Once registered please introduce yourself in our introduction thread which can be found here: Introduction Board
I notice them when I open a thread at the bottom of the screen. It's looks like a banner. I don't notice it on all of them just a few, but I am thinking since tap a talk went free on some of their apps its their way of making money.