I had a rant about the exact same thing on my blog a few weeks ago.
I shall c&p:
There?s those irritating instances of congratulating people who are not on Facebook ON FACEBOOK. They can?t see it so why are you doing that?!
?Happy Anniversary to my gorgeous (or gawjus? cringe) husband/wife, love you babes/hun?, usually accompanied by the obligatory photo of whatever generic gift they bought.
If I can see that your spouse is not on Facebook and therefore cannot see your gushing message, why have you done that? Is it for my benefit and that of 400 strangers? Are you over-compensating or what?
If anything, these unilateral public displays of affection suggest to the reader that something is amiss in your relationship. You are telling the world that everything is fabulous. You are not saying it to the person who you should be saying it to. Because they aren?t on Facebook!
It?s only about the appearance of your relationship to others and it?s nothing to do with whether your relationship actually reflects what you?re saying to the world.
I can imagine the conversation: ?Darling, I put a message on Facebook saying happy anniversary to you, but you won?t have seen it because you aren?t on Facebook?.
Spouse: ?Er, ok. Thanks for that.? Spouse then wonders whether they were meant to put a message on Twitter, even though the other half is not on Twitter.
Anyway, please feel free to share a link to this blog if you love someone, even if that person doesn?t know how to work the internet.