However, the "Shark Tank" judge and O'Shares chairman, still thinks the stock is "sell," despite Facebook crushing analysts' earnings expectations on Wednesday.
"It's a must-own name for institutions," O'Leary said on CNBC's "Halftime Report" on Thursday. "It is the new Apple. The problem it has — it's my problem — is I don't own stocks that have voting class shares. What keeps it out of everybody's portfolio is that fact alone."