Has anybody tried meditating forehead to forehead? Or communicated with others via meditation?
To be quite frank, I don't really see much point in this from a Buddhist perspective. What is the purpose in doing this? Maybe you can have some interesting experiences with different sensations, and for all I know, visions or psychic powers, but in the end these things don't lead towards awakening.

At most, these things could lead to a kind of concentration being developed, but there are other ways of developing concentration that can be used as part of the path. For example, one could develop the jhanas and then use them as a basis for examination. Practicing in that way would probably lead to a lot more pleasure than meditating on the chakras with your foreheads together, and it can be used to gain awakening.