Some recruiters message potential candidates on Facebook and find success in that. Perhaps it depends on the location and the type of a job, whether this would be seen as a good channel to strike a conversation on the receiving side; but it has never appealed to me. My own perception is that Facebook is a place for friends and not as much for business, with the exception of some business-related groups, pages, and some professional connections who are also friends.
As an additional barrier, for non-friends the message will go to their Other folder and will probably be never seen. You may have the option of paying to send messages to the inbox instead, but this option is not always available.
Due to the recent changes to the Facebook emailing system, there is now a way to email (pretty much) everyone on Facebook. There's no sure way to find the email address, registered with Facebook by a given user, but there's a way to send him/her an email.
It goes without saying that spamming is not cool; messages should be sent with respect and consideration. What seems attractive in the new way of emailing is that the business-related message lands in the person's email (and not anywhere on Facebook).
Sending an email to (almost any) Facebook user is pretty straightforward.
How to Find a Facebook User's @facebook.com Email Address
When you look at a user's profile, it will either have a custom URL
- in which case the email is going to be <the-custom-part>@ facebook.com (for the example above it's mrmartinle @ facebook.com) -
or, in case the custom URL was never set, it will look like this:
https://www.facebook.com/profile.php?id= <ID here>
- in which case the email is going to be <ID>@ facebook.com (for the example above it's firstname.lastname@example.org).
How to Send an Email to a Facebook User
You simply send it to the @facebook address and it's forwarded to the email address that is registered with the acc.... That's it!
The first time when that forwarding happens, the user will also receive a reminder about the @facebook email.
The @facebook email can be disabled in the preferences, in which case this technique will not work, but I imagine that very few people will do that. The majority of users never touch their default preferences.