Many teachers are using twitter, facebook and other websites to make an interaction with students (& sometimes parents). Do you think its a good idea?

Yes, i actually do think it is a good idea. It speeds up the process and also it is a reflection of the times we live in. The students are already on this platform and are constantly online on their mobile devices. So if we want to reach them we need to leverage on these platforms.

so that there is no use of paper and its good but every coin has two part. so it has merit and demerit too.