Here’s the thing about Lent: Your thing is your thing. What you give up and what you add on is between you and God, not you and your friends. If you want to bring them into it, asking them to walk with you or hold you accountable, all power to you. If you don’t want anyone but God to know, that’s okay, too.
If, however, you take every opportunity (consciously or unconsciously) to share just how much you’re giving up or how much you’re doing, it’s not holiness you’re seeking — it’s attention.