NEW YORK ( TheStreet) -- Late last year, I riffed positive on what Marissa Mayer and her team at Yahoo! ( YHOO) did with Flickr. I still think Flickr will absolutely annihilate Instagram, if it hasn't already. Mayer noted a 25% daily increase in Flickr photo uploads and engagement on Monday afternoon's Q4 conference call.Ever since Facebook ( FB) limited Instagram's capabilities on Twitter, it's been dead to me. I no longer use it. Even worse, I rarely click on Instagram links in Tweets. I must concede -- for as much as I appreciate what Mayer did to Flickr, I hardly use it anymore either. I think I know why. It has everything to do with convenience, ubiquity and accessibility. That's where Twitter should place focus vis-a-vis its new (and excellent) Vine app. I'll get to that in a second, but let us consider why Vine is so damn good in the first place. If you have or have had young children, you might appreciate this. The other night - actually morning - my nine-year old daughter crawled into our bed at roughly 3:35 a.m. I did what I always do when I wake up in the middle of the night. I pulled my iPhone out from underneath the pillow, launched Twitter to see what I missed while sleeping and play a quick game of Ruzzle before dozing for another hour or so. As that process commenced, my kid said, "Open the Vine app for a minute." I told her about it that day. She liked it and, at 3:30 in the morning, she had the urge to create a quick six-second video clip. Apparently she planned on stealing the phone to capture a series of my reported snores. Anyway, Vine resonated with her. And, while she's a sample of one, I've got a feeling about this app.