It's not a 'lie' unless there's no reasonable truthful interpretation. If other similar efforts weren't official, weren't complete in their coverage, weren't feature-equivalent in any dimension, or weren't 'like' Zuckerberg's Facebook in any other salient way, those would all make that statement ("they didn't have anything like that") true enough for an informal summary conversation. It doesn't deserve to be labelled as "lied point-blank".
(The analysis would of course be different if the question were exactly, "was there anything at all that was anything like The Facebook when you created the first version?" But that's not the case here; he's giving a autobiographical coarse narrative view as he saw it. Normal cordial conversation requires generous and magnanimous listeners who fill in the implied qualifiers for a speaker. You are not a cordial and generous listener when it comes to Facebook topics; you have an axe to grind. You detect 'lies' when no other listener would.)
(The analysis would of course be different if the question were exactly, "was there anything at all that was anything like The Facebook when you created the first version?" But that's not the case here; he's giving a autobiographical coarse narrative view as he saw it. Normal cordial conversation requires generous and magnanimous listeners who fill in the implied qualifiers for a speaker. You are not a cordial and generous listener when it comes to Facebook topics; you have an axe to grind. You detect 'lies' when no other listener would.)