[livatlantis]

Yeah that was the first thing I noticed as well. I'm somewhat surprised (a little sad, even) that the BBC chose not to write it in the subjunctive mood, which is precisely what is required here.

I thought when I read the headline that Instagram was insisting (that is, reiterating) that Littergram was already renamed.

[dempseye]

The subjunctive is ingrained in my internal English grammar model, as is the who-whom distinction. I've been thinking about dropping them, though. They have started to sound a bit elitist.

[livatlantis]

Well, you can always adapt your speech to your audience. But I don't see why it should be seen as elitist.