I don't like to think that this is just me going all old-fogey in the "...we had to use the letter O" sense. But I mostly can't see the point of re-tweeting--at least not in any "shotgun" fashion. If a retweet's targeted at specific followers, yeah, that I get. Otherwise, the value-add's over my head. Then again, the dot-com coattail-surfers made such a travesty out of the concept of a "portal" that maybe I'm just looking at this as the proverbial old wine in new bottles.
Of course, there's always the possibility that my nieces and nephews are right and I'm just too uncool for this newfangled social media. After all, I did cut my dentures on Web 1.0, don'cha'know?