The references in the hadith to ''a hand reaching out from the sky'' and saying ''this is Hazrat Mahdi (as), follow him.'' suggest that Hazrat Mahdi's (as) hand will be seen on the internet and TV

In the hadith our Prophet (saas) reveals that one of the signs before the coming of Hazrat Mahdi (as) that will enable people to recognize him is “a hand reaching out from the sky.” Again according to the hadith, “people will see and look at” this hand. Together with this hand that reaches out from the sky, a voice will be heard saying, “The saint of Allah [(Hazrat Mahdi (as)] is such and such a companion.” That voice will be that of Hazrat Mahdi (as). Hazrat Mahdi (as) will not claim to be Hazrat Mahdi (as), but as the person who is best informed about him, he will describe Hazrat Mahdi (as) through the television and the Internet.

Again according to the indications in the hadith, Hazrat Mahdi (as) will appear before people’s eyes through the television and the Internet, and people will thus constantly see his hand. The signs also indicate that, like the hand of the Prophet Musa (as) as described in the Qur’an, Hazrat Mahdi’s (as) hand will be very attractive and eye-catching. And it seems that his hand will always be prominently displayed.  

Another hadith says that “Hazrat Mahdi (as) will use his hands when he talks; he will move his hand as he wishes to emphasize what he is saying and that people will see those motions:”