What’s the shelf-life on using social media to flaunt your new relationship after cheating on your ex-wife? Not only has Jesse James used twitter to declare his love for Kat Von D, but he’s also made an official engagement announcement, saying that 2010 was the “best year of his life.” First, if it’s true that the year your marriage fell apart because of your infidelity was in fact your greatest year, keep it to yourself. There’s no need to tell the entire world (which includes your ex-wife). Second, using twitter to write sweet nothings to your new lady is completely inappropriate. Just ask Leann Rimes. It’s too soon — and tacky.