You can get dressed up all special, and people notice

When you eat RL chocolate… you can taste it.

If you do phone a friend at 4am to say "I'm down" they take it seriously.

In RL, you can be alone on purpose without seeming antisocial.

People try to get you to stay "just a little longer" and make you feel wanted.

You can almost always find someone who has never met or heard of your SO
(possibly on a bus), so you can bitch about him in perfect privacy.

And, most importantly

A *hug* is always nice, but a real, close, body-touching real life hug is … nicer :)