for my close friends facebook / twitter is useful for passive information, they might say they watched a film and it wasnt great, I dont discuss every film my friends have ever watched, but I would take into consideration their opinion.
For friends that I dont live nearby, I can keep track of what they are up to, say hello once in a while, and not lose track of them for 20+ years, then when they or I have time to go visit I know where to get in contact.
I have people that I meet through the work I do, I want to know what they are working on, if they are working on something cool that I am interested in then I find out.
for people I dont even know but seem to consistently talk about things I am interesting in then I dont need to ask for them to send me a weekly update email
for my close friends facebook / twitter is useful for passive information, they might say they watched a film and it wasnt great, I dont discuss every film my friends have ever watched, but I would take into consideration their opinion.
For friends that I dont live nearby, I can keep track of what they are up to, say hello once in a while, and not lose track of them for 20+ years, then when they or I have time to go visit I know where to get in contact.
I have people that I meet through the work I do, I want to know what they are working on, if they are working on something cool that I am interested in then I find out.
for people I dont even know but seem to consistently talk about things I am interesting in then I dont need to ask for them to send me a weekly update email