I'm adding 2 more Link Units on my site and I'm experimenting with one of it. My question is: If I place a vertical link unit at the bottom of some article and near link unit is "ADDTHIS" - social networking button, is it OK with TOS? You can see here what I'm asking. http://puregreencars.com/news/Full-Review-2008-Lexus-LS600hL.html
Just make sure thier is a space between the 2. I like to use double space so it is clear that they are not related.
I agree with the previous poster: make more space between the link-unit and the bookmarking buttons. This is likely to cause stray clicks in a way that is against the google TOS.
I read a post on AdSense blog about this issue. You must make sure that your visitors is not clicking on any Google ads without being interested about the ads. I mean You can't do anything so that your visitors click on these ads thinking that that was the content of your site. So blend your ads properly.
if you users can realise that one of them is add this button (or link) and the other is an ads , it will not be a problem
Just the fact that you are asking if this is OK should make you think twice before setting up a layout.