No, no issues at all. The like-jacker that I use will only post one "Like" per unique visitor to my site. So they could click 20 different links on my site but only one "Like" would be posted to their wall.
It keeps what I'm doing under the radar and the tool only like-jacks a visitor if they're logged in to their FB account. So if they're not logged in to a FB the tool won't even try to like-jack them. This avoids any pop-up boxes or alerts from popping up asking the visitor to log in to FB etc.
The tool is a WP plugin so it is limited, at the moment, to only being used on self hosted WP blogs.