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I'm glad this topic came up and I get to read the responses. As a university student working toward a degree in Elementary Education I have thought about this a lot. On one hand I do want my students to be able to reach me when there is a need. On the other hand, the potential for abuse of personal information is very high. I think I will not give my personal information unless there is a case by case need for it. Teachers also need to think about how they are being perceived. A friend of mine has a daughter in 6th grade. The teacher regularly emails and chats with the students about non-school related topics. This bothers me. So... the topic of sharing personal information is not just something to think about in terms of teachers being bugged too often, but for teachers crossing lines that are inappropriate as well.
I think it is important that you are not only classroom teacher but also i person who is ready to help and give advice. That's why always the first thing I do when i begin to work with a new group - I give my mobile number and e-mail if they ask.
Since I am a special education teacher I tend to give my phone number to the parents if a reason for doing so comes up. I will give it to high school age students if they ask for it. For example, when I was picking up a girl for a choir concert because her mother had to work, I gave her my number. My phone number is listed. In a few cases we have shared email addresses, and if the information is confidential, I use my home e-mail.
I have known some who would give out their cell number, but not their home phone, that being a good way to control calls. Plus the cell is not connected to an address, a good way to avoid early morning knocks.
I think personal information should be given carefully on a need-to-know basis. If there is something about a teacher's life she does not want her kids to discuss, she needs to be real scrupulous. For example, I know a teacher in a conservative state who lives an hour away from her job in a different county. Part of her reason for not moving closer to her job is because she is gay and has a life partner. While this would not be a problem in less backward states, in this state it could have the fundamentalists foaming at the mouth and demanding she be fired, even though she has been with the system for many years. Her students have asked why she lives so far from her job and she is honest, telling them that she likes to keep her job and her personal life separate.