Using AC Termination for driven clocks
It is only really useful with continuous clocks and even then is as much about dealing with different bias between say PECL and LVDS as anything else.

You would only use it in a data line if the data was DC restored in some way or coded with something like biphase or 8B10 that has a constant average value. 

If one of the datasheets says AC couple, or if you cannot make the biasing work any other way (And DC conditions are not data dependent) then maybe, otherwise don't bother. 

Regards, Dan.