Do Seat Posts with Shock Absorbers Help? I have Fuji Absolute 1.9D road bike. Is the seat post on this bike fitted with ashock absorber?  I don't think so. If not, would it be worth replacing the original seat post with shock absorbing one? 

Thank you
Your bike probably does not have a suspension seat post. 

They are great for smoothing out small bumps on rough roads, and help with people whose anatomy is not 'cycle hardened'. For less fit riders, you do not need to unload the seat by standing for small bumps, so can make a ride less tiring. They also help soften the blow where you misjudge a bump and its bigger than expected. 

However, they also loose some pedalling efficiency due to the changing length of the seat-pedals, so few serious cyclists use them. 

Most people love or hate them, not much middle ground. People who love them are usually casual cyclists. I have used one on a MTB hardtail, but ride often enough it makes little difference to me. My wife currently does because she rides rarely, and it helps smooth out the bumps on the hard packed MTB trails she rides. 

Should you get one? Only if you ride with padded shorts and still want a bit more comfort. if you try one and like it, as you get more miles under you belt, you may find you don't need it, or even dislike it.  It could be worth holding off getting one for a while and giving time for your body to adapt to riding.