In the last 24 hours, a single petition has attracted 700,000 signatures, and is now nudging a million total signatures. That's 1% of the total population in 24 hours, and say 2% of the voting population in total. The petition is very, very simple. "Revoke Article 50" - that is, stop the UK withdrawal from the EU.
The people who digitally sign the petition basically know that it's not going to change anything - the deal with government petitions is that over 100,000 signatures will mean that a petition will be "considered" for debate in parliament; that's the best that's on offer - but since parliament is largely preoccupied by the issue of Brexit anyway, the likelihood of this specific item receiving separate consideration is slim. The same goes, I imagine, for the people who are planning to march in London on Saturday in support of a new referendum. At this stage, it's unlikely to change anything - but people want the government to know that this is not happening in their name.
The justification for signing the petition is that for large numbers of people, their belief that the simplest and best way out of this mess is just to stop it, is not being articulated. The views of the 17.4 million people who voted to leave in the referendum are talked about continually - and the non-binding referendum has become binding, and the fact that we were told that arrangements for leaving would be agreed in advance has been ignored. If 2% of MPs expressed this view, 12 of them would have stood up in parliament and asked for the process to stop in the last few messy weeks. If even one person had stood up and articulated it, it might have been enough raising of a flag to get it on the table. But even the europhile LibDems instead have focussed on the expensive and dubious option of a second referendum. Revoking Article 50 is clearly not a less-than-1% option - but you wouldn't know that given the failure of any politicians to contemplate it.