Charles Williams said that in the end, all loves must be physical. Screwtape was content if the patient's love was limited to fantasy--it didn't matter how glorious love was if it never made any difference. I find that my reaction to hearing of someone's illness is to pray for them briefly, think about whether there's anything that should be done, and then move on to other things--but Jesus didn't say "I was sick and you thought about me."
There is something important about investing not just my attention but my body in my works. A text or email message is good, a phone call has more presence, but being there in person means I'm putting my whole self in service to meeting you. (Assuming my mind isn't elsewhere--I remember my school days...) A Facebook "friend" may be the best connection possible between people too far apart, but it is a flimsy wraith compared to flesh and blood conversation. Face to face it isn't just my spirit that is with you, but all of me.
Maybe texting and Twitter are two of the nine rings: they give the illusion of stretching your life to more and more people, but at the price of stretching you thinner and thinner.
(*)Thinking of math is good, but putting pencil to paper to develop it is better.