As more or less the same types of ephemeral things you say either while chatting with a friend in a bar, towards the TV/Radio when you are watching and event, or towards the car in front of you while driving.
to send out reminders to students and to let them know when I have posted grades, etc. About 1/5 of my students follow me on the first semester I have tried it. I like it from that angle.
There are a couple DUers that post links to news and that service is pretty good.
Is there a lot of crap on there? Sure. Just don't follow those people.
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