As far as I know, the point of this website is to learn languages, so the reason why you get contacted is to assist in this and not to creep you out.

There is nothing wrong with starting a conversation with a simple word or a phrase without going into profound explanations. Using 'hi' as your starter or something similar is completely acceptable. Most of the messages that I receive actually start exactly this way and then turn into conversations without a problem.

To agree with Adnen, it's better to get a simple "hi" and go on from that, than to read a long paragraph, especially if it's based on some guidelines.

Neverthless, to each his own.