Yes .....some company soon makes it possible :
http://www.talktoaliens.com/
Your messages/phone calls send into space
So is there anything on your chest you want to shout out there ?
Like ....
How many of you are there out there ?
Do you know how it all began ?
Will the King make another tour on this planet ?
Is Tony Blair really a alien spy ?
How many boobies do the females on your planet have ?
..ehm....how many genders are there on your planet

?
Further more ...if communication goes both ways..... we might actually see aliens posting messages on these boards !
