My friends here in LJ may have noticed that I don't participate in the celebratory birthday posts that are an LJ custom.
This is not because I do not wish you well on your birthday. This is not because I do not wish to celebrate the day you were added to this world to its great benefit. It's not because I don't know about it (LJ is good about reminders), and it's not because I forget.
It's just that were I to start posting them, there would inevitably come the time when I don't post one. Life would Happen just then, or I'd confuse intention with performance, or any number of ditzy or simply human things would interfere. I am concerned that those inevitable omissions could hurt feelings.
So, I simply don't send them -- then no one is left out.