I think one reason people pooh-pooh internet names is that internet fame is so fleeting. The Lexus and Nautica brands have existed for the entire lifespan of many of today's parents, whereas hashtags have only been around for a couple years.

I think the example of Yahoo is a good one here; seven years ago, Yahoo was cool, but now it's really not. Who the heck Yahoos anything anymore? So it seems painfully short-sighted to name a kid for a brand that is likely to be derided as obsolete before the kid's even in kindergarten.

I mean, imagine if you had named your kid MySpace!