hey, if i have 3 adsense units, can i have one more? not so close to them, in the footer.. if yes, i need to make another text colors? another form? if no, why so?
Yes, you can. And the colors would not need to be different (and the form would not need to be different either). This is a new change (about a year ago) - if I am remembering correctly, it used to be that if you displayed AdSense ads, that was all you could display.