Cause to Pause

I was talking to a friend recently about all things social (media, that is). Like most folks, he does not see the value in twitter for his needs. Middle aged, retired, busy. Facebook, he gets. Twitter…not so much. In his mind “I don’t need another inbox, and I don’t spend a lot of time on my phone.”
This got me to thinking about twitter usage. The vast majority of my usage does, in fact, come from my phone. Sure, I have tweetdeck on my home and portable PCs (not my company desktop), but just as often as not, I have it turned off. However, if I am moving, the phone is generally out.
Facebook, it seems is more “stationary” for me. If I am going to post there (combined twitter-facebook posts excluded), I am generally sitting a chair. I also often proof-read my posts to other people and ask questions like “Do I really need to say this? How will it be received? What kind of message am I sending?” More of a “let’s sit down at the kitchen table with some bacon and visit”.
What about you? Do you think twitter lends itself more to “moving, on the go” posts and Facebook more of a “sit down, think about what I am going to write and upload” scenario? When you think “twitter” do you think 20-something walking between coffee shops and when you think “facebook” do you somehow visualize old friends reconnecting at a more leisurely pace?