First it was Vine, then it was Instagram, and now Facebooks getting in the mix. Before grabbing your pitchfork to storm Facebooks headquarters over slurping all your mobile bandwidth, the feature can be set to work only over Wi-Fi, something that can be toggled in Facebooks settings. While handy for casual browsing, this feature is likely the precursor to whats expected to be an onslaught of new video advertising on Facebooks mobile apps.